ETSI TS 102 361-1 V1.4.5 (2007-12)
Technical Specification
Electromagnetic compatibility
and Radio spectrum Matters (ERM);
Digital Mobile Radio (DMR) Systems;
Part 1: DMR Air Interface (AI) protocol
ETSI
ETSI TS 102 361
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1 V1.4.5 (2007
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12)
2
Reference
RTS/ERM-TGDMR-270-1
Keywords
air interface, digital, PMR, protocol, radio
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ETSI
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Contents
Intellectual Property Rights................................................................................................................................8
Foreword.............................................................................................................................................................8
1 Scope........................................................................................................................................................9
2 References................................................................................................................................................9
2.1 Normative references .......................................................................................................................................10
3 Definitions, symbols and abbreviations .................................................................................................10
3.1 Definitions........................................................................................................................................................10
3.2 Symbols............................................................................................................................................................13
3.3 Abbreviations ...................................................................................................................................................13
4 Overview................................................................................................................................................15
4.1 Protocol architecture.........................................................................................................................................15
4.1.1 Air Interface Physical Layer (layer 1).........................................................................................................16
4.1.2 Air Interface Data Link Layer (layer 2)......................................................................................................17
4.1.3 Air Interface Call Control Layer (CCL) (layer 3).......................................................................................17
4.2 DMR TDMA structure.....................................................................................................................................17
4.2.1 Overview of burst and channel structure ....................................................................................................17
4.2.2 Burst and frame structure............................................................................................................................19
4.3 Frame synchronization .....................................................................................................................................20
4.4 Timing references.............................................................................................................................................22
4.4.1 Repeater mode BS established timing relationship.....................................................................................22
4.4.2 Repeater mode MS established timing relationship....................................................................................22
4.4.3 Direct mode timing relationship .................................................................................................................22
4.5 Common Announcement Channel (CACH).....................................................................................................23
4.6 Basic channel types ..........................................................................................................................................24
4.6.1 Traffic channel with CACH........................................................................................................................24
4.6.2 Traffic channel with guard time..................................................................................................................24
4.6.3 Bi-directional channel.................................................................................................................................25
5 Layer 2 protocol description...................................................................................................................25
5.1 Layer 2 timing ..................................................................................................................................................25
5.1.1 Channel timing relationship........................................................................................................................25
5.1.1.1 Aligned channel timing.........................................................................................................................26
5.1.1.2 Offset channel timing............................................................................................................................26
5.1.2 Voice timing ...............................................................................................................................................27
5.1.2.1 Voice superframe ..................................................................................................................................27
5.1.2.2 Voice initiation......................................................................................................................................27
5.1.2.3 Voice termination..................................................................................................................................28
5.1.3 Data timing .................................................................................................................................................28
5.1.3.1 Single slot data timing...........................................................................................................................29
5.1.3.2 Dual slot data timing.............................................................................................................................29
5.1.4 Traffic timing..............................................................................................................................................30
5.1.4.1 BS timing ..............................................................................................................................................30
5.1.4.2 Single frequency BS timing ..................................................................................................................31
5.1.4.3 Direct mode timing ...............................................................................................................................31
5.1.4.4 Time Division Duplex (TDD) timing....................................................................................................32
5.1.4.5 Continuous transmission mode .............................................................................................................32
5.1.5 Reverse Channel (RC) timing.....................................................................................................................33
5.1.5.1 Embedded outbound Reverse Channel (RC).........................................................................................33
5.1.5.2 Dedicated outbound Reverse Channel (RC) .........................................................................................34
5.1.5.3 Standalone inbound Reverse Channel (RC)..........................................................................................34
5.1.5.4 Direct mode Reverse Channel (RC)......................................................................................................35
5.2 Channel access .................................................................................................................................................35
5.2.1 Basic channel access rules ..........................................................................................................................36
5.2.1.1 Types of channel activity ......................................................................................................................36
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5.2.1.2 Channel status .......................................................................................................................................37
5.2.1.3 Timing master .......................................................................................................................................37
5.2.1.4 Hang time messages and timers ............................................................................................................38
5.2.1.5 Slot 1 and 2 dependency .......................................................................................................................38
5.2.1.6 Transmit admit criteria..........................................................................................................................38
5.2.1.7 Transmission re-tries.............................................................................................................................39
5.2.2 Channel access procedure...........................................................................................................................39
5.2.2.1 Direct mode Channel Access ................................................................................................................39
5.2.2.1.1 MS Out_of_Sync Channel Access...................................................................................................40
5.2.2.1.2 MS Out_of_Sync_Channel_Monitored Channel Access.................................................................42
5.2.2.1.3 MS In_Sync_Unknown_System Channel Access ...........................................................................43
5.2.2.1.4 MS Not_in_Call Channel Access....................................................................................................44
5.2.2.1.5 MS Others_Call Channel Access ....................................................................................................44
5.2.2.1.6 MS My_Call Channel Access..........................................................................................................44
5.2.2.2 Repeater mode channel access..............................................................................................................44
5.2.2.2.1 MS Out_of_Sync Channel Access...................................................................................................44
5.2.2.2.2 MS Out_of_Sync_Channel_Monitored Channel Access.................................................................46
5.2.2.2.3 MS In_Sync_Unknown_System channel access.............................................................................47
5.2.2.2.4 MS TX_Wakeup_Message..............................................................................................................48
5.2.2.2.5 MS Not_In_Call channel access......................................................................................................49
5.2.2.2.6 MS Others_Call channel access ......................................................................................................50
5.2.2.2.7 MS My_Call channel access............................................................................................................50
5.2.2.2.8 MS In_Session channel access ........................................................................................................50
5.2.2.3 Non-time critical CSBK ACK/NACK channel access..........................................................................50
6 Layer 2 burst format...............................................................................................................................51
6.1 Vocoder socket.................................................................................................................................................52
6.2 Data and control ...............................................................................................................................................53
6.3 Common Announcement Channel burst...........................................................................................................54
6.4 Reverse Channel...............................................................................................................................................55
6.4.1 Standalone inbound Reverse Channel burst................................................................................................55
6.4.2 Outbound reverse channel (RC) burst.........................................................................................................56
7 DMR signalling......................................................................................................................................56
7.1 Link Control message structure........................................................................................................................56
7.1.1 Voice LC header.........................................................................................................................................57
7.1.2 Terminator with LC ....................................................................................................................................59
7.1.3 Embedded signalling...................................................................................................................................59
7.1.3.1 Outbound channel .................................................................................................................................60
7.1.3.2 Inbound channel....................................................................................................................................61
7.1.4 Short Link Control in CACH......................................................................................................................61
7.2 Control Signalling BlocK (CSBK) message structure......................................................................................62
7.2.1 Control Signalling BlocK (CSBK) .............................................................................................................63
7.3 Idle message.....................................................................................................................................................64
7.4 Multi Block Control (MBC) message structure................................................................................................64
7.4.1 Multi Block Control (MBC) .......................................................................................................................66
8 DMR Packet Data Protocol (PDP).........................................................................................................67
8.1 Internet Protocol...............................................................................................................................................67
8.2 Datagram fragmentation and re-assembly........................................................................................................68
8.2.1 Header block structure................................................................................................................................69
8.2.1.1 Unconfirmed data Header .....................................................................................................................70
8.2.1.2 Confirmed data header..........................................................................................................................71
8.2.1.3 Response data header............................................................................................................................71
8.2.1.4 Proprietary data header .........................................................................................................................71
8.2.1.5 Status/precoded short data header.........................................................................................................72
8.2.1.6 Raw short data header...........................................................................................................................73
8.2.1.7 Defined short data header......................................................................................................................73
8.2.1.8 Unified Data Transport (UDT) data header...........................................................................................74
8.2.2 Data block structure....................................................................................................................................74
8.2.2.1 Unconfirmed data block structure.........................................................................................................74
8.2.2.2 Confirmed data block structure.............................................................................................................77
8.2.2.3 Response packet format ........................................................................................................................80
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8.2.2.4 Hang time for response packet..............................................................................................................82
8.2.2.5 Unified Data Transport (UDT) last data block structure.......................................................................82
9 Layer 2 PDU description........................................................................................................................83
9.1 PDUs for voice bursts, general data bursts and the CACH ..............................................................................84
9.1.1 Synchronization (SYNC) PDU...................................................................................................................84
9.1.2 Embedded signalling (EMB) PDU .............................................................................................................84
9.1.3 Slot Type (SLOT) PDU..............................................................................................................................85
9.1.4 TACT PDU.................................................................................................................................................85
9.1.5 Reverse Channel (RC) PDU .......................................................................................................................85
9.1.6 Full Link Control (FULL LC) PDU............................................................................................................85
9.1.7 Short Link Control (SHORT LC) PDU ......................................................................................................86
9.1.8 Control Signalling Block (CSBK) PDU .....................................................................................................86
9.1.9 Pseudo Random Fill Bit (PR FILL) PDU...................................................................................................86
9.2 Data related PDU description...........................................................................................................................86
9.2.1 Confirmed packet Header (C_HEAD) PDU...............................................................................................87
9.2.2 Rate ¾ coded packet Data (R_3_4_DATA) PDU ......................................................................................87
9.2.3 Rate ¾ coded Last Data block (R_3_4_LDATA) PDU..............................................................................87
9.2.4 Confirmed Response packet Header (C_RHEAD) PDU............................................................................88
9.2.5 Confirmed Response packet Data (C_RDATA) PDU................................................................................88
9.2.6 Unconfirmed data packet Header (U_HEAD) PDU...................................................................................89
9.2.7 Rate ½ coded packet Data (R_1_2_DATA) PDU ......................................................................................89
9.2.8 Rate ½ coded Last Data block (R_1_2_LDATA) PDU..............................................................................90
9.2.9 Proprietary Header (P_HEAD) PDU..........................................................................................................90
9.2.10 Status/Precoded short data packet Header (SP_HEAD) PDU ....................................................................91
9.2.11 Raw short data packet Header (R_HEAD) PDU ........................................................................................91
9.2.12 Defined Data short data packet Header (DD_HEAD) PDU .......................................................................92
9.2.13 Unified Data Transport Header (UDT_HEAD) PDU.................................................................................92
9.2.14 Unified Data Transport Last Data block (UDT_LDATA) PDU.................................................................92
9.2.15 Rate 1 coded packet Data (R_1_DATA) PDU ...........................................................................................93
9.2.16 Rate 1 coded Last Data block (R_1_LDATA) PDU...................................................................................93
9.3 Layer 2 information element coding ................................................................................................................93
9.3.1 Colour Code (CC).......................................................................................................................................94
9.3.2 Privacy Indicator (PI)..................................................................................................................................94
9.3.3 LC Start/Stop (LCSS).................................................................................................................................94
9.3.4 EMB parity .................................................................................................................................................94
9.3.5 Feature set ID (FID)....................................................................................................................................95
9.3.6 Data Type....................................................................................................................................................95
9.3.7 Slot Type parity ..........................................................................................................................................95
9.3.8 Access Type (AT).......................................................................................................................................96
9.3.9 TDMA Channel (TC)..................................................................................................................................96
9.3.10 Protect Flag (PF).........................................................................................................................................96
9.3.11 Full Link Control Opcode (FLCO).............................................................................................................96
9.3.12 Short Link Control Opcode (SLCO)...........................................................................................................96
9.3.13 TACT parity................................................................................................................................................97
9.3.14 RC parity.....................................................................................................................................................97
9.3.15 Group or Individual (G/I) ...........................................................................................................................97
9.3.16 Response Requested (A).............................................................................................................................97
9.3.17 Data Packet Format (DPF)..........................................................................................................................97
9.3.17A Header Compression (HC)..........................................................................................................................98
9.3.18 SAP identifier (SAP) ..................................................................................................................................98
9.3.19 Logical Link ID (LLID)..............................................................................................................................98
9.3.20 Full message flag (F) ..................................................................................................................................98
9.3.21 Blocks to Follow (BF) ................................................................................................................................98
9.3.22 Pad Octet Count (POC)...............................................................................................................................99
9.3.23 Re-Synchronize Flag (S).............................................................................................................................99
9.3.24 Send sequence number (N(S)) ....................................................................................................................99
9.3.25 Fragment Sequence Number (FSN)..........................................................................................................100
9.3.26 Data Block Serial Number (DBSN)..........................................................................................................100
9.3.27 Data block CRC (CRC-9).........................................................................................................................100
9.3.28 Class (Class) .............................................................................................................................................101
9.3.29 Type (Type)..............................................................................................................................................101
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9.3.30 Status (Status)...........................................................................................................................................101
9.3.31 Last Block (LB)........................................................................................................................................101
9.3.32 Control Signalling BlocK Opcode (CSBKO)...........................................................................................101
9.3.33 Appended Blocks (AB).............................................................................................................................102
9.3.34 Source Port (SP) .......................................................................................................................................102
9.3.35 Destination Port (DP)................................................................................................................................102
9.3.36 Status/Precoded (S_P)...............................................................................................................................102
9.3.37 Selective Automatic Repeat reQuest (SARQ) ..........................................................................................102
9.3.38 Defined Data format (DD)........................................................................................................................102
9.3.39 Unified Data Transport Format (UDT Format) ........................................................................................103
9.3.40 UDT Appended Blocks (UAB).................................................................................................................103
9.3.41 Supplementary Flag (SF)..........................................................................................................................104
9.3.42 Pad Nibble ................................................................................................................................................104
10 Physical Layer......................................................................................................................................104
10.1 General parameters.........................................................................................................................................104
10.1.1 Frequency range........................................................................................................................................104
10.1.2 RF carrier bandwidth ................................................................................................................................104
10.1.3 Transmit frequency error ..........................................................................................................................104
10.1.4 Time base clock drift error........................................................................................................................105
10.2 Modulation.....................................................................................................................................................105
10.2.1 Symbols ....................................................................................................................................................105
10.2.2 4FSK generation.......................................................................................................................................105
10.2.2.1 Deviation index...................................................................................................................................105
10.2.2.2 Square root raised cosine filter............................................................................................................106
10.2.2.3 4FSK Modulator .................................................................................................................................106
10.2.3 Burst timing ..............................................................................................................................................106
10.2.3.1 Normal burst .......................................................................................................................................107
10.2.3.1.1 Power ramp time............................................................................................................................107
10.2.3.1.2 Symbol timing...............................................................................................................................108
10.2.3.1.3 Propagation delay and transmission time ......................................................................................108
10.2.3.2 Reverse channel (RC) burst.................................................................................................................109
10.2.3.2.1 Power ramp time............................................................................................................................109
10.2.3.2.2 Symbol timing...............................................................................................................................110
10.2.3.2.3 Propagation delay..........................................................................................................................110
10.2.3.3 Synthesizer Lock-Time constraints.....................................................................................................110
10.2.3.4 Transient frequency constraints during symbol transmission time .....................................................111
Annex A (normative): Numbering and addressing.........................................................................112
Annex B (normative): FEC and CRC codes....................................................................................113
B.1 Block Product Turbo Codes .................................................................................................................114
B.1.1 BPTC (196,96)...............................................................................................................................................114
B.2 Variable length BPTC..........................................................................................................................117
B.2.1 Variable length BPTC for embedded signalling.............................................................................................117
B.2.2 Variable length BPTC for Reverse Channel...................................................................................................119
B.2.3 Variable length BPTC for CACH signalling..................................................................................................120
B.2.4 Rate ¾ Trellis code.........................................................................................................................................122
B.2.5 Rate 1 coded data ...........................................................................................................................................126
B.3 Generator matrices and polynomials....................................................................................................128
B.3.1 Golay (20,8) ...................................................................................................................................................128
B.3.2 Quadratic residue (16,7,6)..............................................................................................................................128
B.3.3 Hamming (17,12,3) ........................................................................................................................................129
B.3.4 Hamming (13,9,3), Hamming (15,11,3), and Hamming (16,11,4).................................................................129
B.3.5 Hamming (7,4,3) ............................................................................................................................................130
B.3.6 Reed-Solomon (12,9) .....................................................................................................................................130
B.3.7 8-bit CRC calculation.....................................................................................................................................132
B.3.8 CRC-CCITT calculation.................................................................................................................................133
B.3.9 32-bit CRC calculation...................................................................................................................................133
B.3.10 CRC-9 calculation..........................................................................................................................................135
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B.3.11 5-bit Checksum (CS) calculation....................................................................................................................136
B.3.12 Data Type CRC Mask ....................................................................................................................................137
B.4 Interleaving...........................................................................................................................................138
B.4.1 CACH interleaving.........................................................................................................................................138
Annex C (informative): Example timing diagrams...........................................................................139
C.1 Direct mode timing...............................................................................................................................139
C.2 Reverse Channel timing .......................................................................................................................139
Annex D (normative): Idle and Null message bit definition...........................................................140
D.1 Null embedded message bit definitions................................................................................................140
D.2 Idle message bit definitions..................................................................................................................141
Annex E (normative): Transmit bit order .......................................................................................143
Annex F (normative): Timers and constants in DMR....................................................................156
F.1 Layer 2 timers.......................................................................................................................................156
F.2 Layer 2 constants..................................................................................................................................157
Annex G (informative): High level states overview ...........................................................................158
G.1 High Level MS states and SDL description.........................................................................................158
G.1.1 MS Level 1 SDL ............................................................................................................................................158
G.1.2 MS Level 2 SDL ............................................................................................................................................161
G.2 High level BS states and SDL descriptions..........................................................................................163
G.2.1 BS Both Slots SDL.........................................................................................................................................163
G.2.2 BS Single Slot SDL........................................................................................................................................164
Annex H (normative): Feature interoperability ..............................................................................166
H.1 Feature set ID (FID) .............................................................................................................................166
H.2 Application for Manufacturer's Feature set ID.....................................................................................166
Annex I (informative): ETSI MFID application form.....................................................................167
Annex J (informative): Change requests...........................................................................................169
Annex K (informative): Bibliography.................................................................................................171
History............................................................................................................................................................172
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Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp
).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web
server) which are, or may be, or may become, essential to the present document.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Electromagnetic compatibility and
Radio spectrum Matters (ERM).
The present document is part 1 of a multi-part deliverable covering the Technical Requirements for Digital Mobile
Radio (DMR), as identified below:
Part 1: "DMR Air Interface (AI) protocol";
Part 2: "DMR voice and generic services and facilities";
Part 3: "DMR data protocol";
Part 4: "DMR trunking protocol".
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1 Scope
The present document contains technical requirements for Digital Mobile Radio (DMR) operating in the existing
licensed land mobile service frequency bands, as identified in CEPT/ERC/T/R 25-08 [7].
The present document describes the Air Interface of a scalable Digital Mobile Radio system which covers three tiers of
possible products:
• Tier I: DMR equipment having an integral antenna and working in direct mode (communication without
infrastructure) under a general authorization with no individual rights operation.
• Tier II: DMR systems operating under individual licences working in direct mode or using a Base Station (BS)
for repeating.
• Tier III: DMR trunking systems under individual licences operating with a controller function that
automatically regulates the communications.
NOTE 1: Tier II and Tier III products encompass both simulcast and non-simulcast systems.
NOTE 2: The three tiers of possible products will work only independently and not interoperable.
(For more information please see the System reference documents referenced in the bibliography.)
The present document specifies the Air Interface, complying with either EN 300 113-1 [1] and EN 300 113-2 [2] or
EN 300 390-1 [3] and EN 300 390-2 [4], that has been specifically developed with the intention of being suitable for all
identified product tiers. A polite spectrum access protocol for sharing the physical channel has also been specified.
Specifically, in this case for use in the existing land mobile service bands with the intention of causing minimum
change to the spectrum planning and regulations. Thus the DMR protocol is intended to be applicable to the land mobile
frequency bands, physical channel offset, duplex spacing, range assumptions and all other spectrum parameters without
need for any change.
2 References
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific.
• For a specific reference, subsequent revisions do not apply.
• Non-specific reference may be made only to a complete document or a part thereof and only in the following
cases:
- if it is accepted that it will be possible to use all future changes of the referenced document for the purposes
of the referring document;
- for informative references.
Referenced documents which are not found to be publicly available in the expected location might be found at
http://docbox.etsi.org/Reference
.
For online referenced documents, information sufficient to identify and locate the source shall be provided. Preferably,
the primary source of the referenced document should be cited, in order to ensure traceability. Furthermore, the
reference should, as far as possible, remain valid for the expected life of the document. The reference shall include the
method of access to the referenced document and the full network address, with the same punctuation and use of upper
case and lower case letters.
NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee
their long term validity.
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2.1 Normative references
The following referenced documents are indispensable for the application of the present document. For dated
references, only the edition cited applies. For non-specific references, the latest edition of the referenced document
(including any amendments) applies.
[1] ETSI EN 300 113-1: "Electromagnetic compatibility and Radio spectrum Matters (ERM); Land
mobile service; Radio equipment intended for the transmission of data (and/or speech) using
constant or non-constant envelope modulation and having an antenna connector; Part 1: Technical
characteristics and methods of measurement".
[2] ETSI EN 300 113-2: "Electromagnetic compatibility and Radio spectrum Matters (ERM); Land
mobile service; Radio equipment intended for the transmission of data (and/or speech) using
constant or non-constant envelope modulation and having an antenna connector; Part 2:
Harmonized EN covering essential requirements of article 3.2 of the R&TTE Directive".
[3] ETSI EN 300 390-1: "ElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Land
Mobile Service; Radio equipment intended for the transmission of data (and speech) and using an
integral antenna; Part 1: Technical characteristics and test conditions".
[4] ETSI EN 300 390-2: "Electromagnetic compatibility and Radio spectrum Matters (ERM); Land
Mobile Service; Radio equipment intended for the transmission of data (and speech) and using an
integral antenna; Part 2: Harmonized EN covering essential requirements under article 3.2 of the
R&TTE Directive".
[5] ETSI TS 102 361-2: "Electromagnetic compatibility and Radio spectrum Matters (ERM); Digital
Mobile Radio (DMR) Systems; Part 2: DMR voice and generic services and facilities".
[6] IETF RFC 791: "Internet Protocol; DARPA Internet Program; Protocol Specification".
[7] CEPT/ERC/T/R 25-08: "Planning criteria and co-ordination of frequencies in the Land Mobile
Service in the range 29,7 - 921 MHz".
[8] IEC 61162-1: "Maritime navigation and radiocommunications equipment and systems - Digital
interfaces - Part 1: Single talker and multiple listeners".
[9] ISO/IEC 646: "Information technology - ISO 7-bit coded character set for information
interchange".
[10] ISO/IEC 8859: "Information technology - 8-bit single-byte coded graphic character sets".
[11] ETSI TS 102 361-4: "Electromagnetic compatibility and Radio spectrum Matters (ERM); Digital
Mobile Radio (DMR) Systems; Part 4: DMR trunking protocol".
[12] ETSI TS 102 361-3: "Electromagnetic compatibility and Radio spectrum Matters (ERM); Digital
Mobile Radio (DMR) Systems; Part 3: DMR data protocol".
[13] ETSI TS 102 361-1: "Electromagnetic compatibility and Radio spectrum Matters (ERM); Digital
Mobile Radio (DMR) Systems; Part 1: DMR Air Interface (AI) protocol".
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the following terms and definitions apply:
1:1-mode: 1 traffic channel mode
NOTE: 1:1-mode supports one "MS to fixed end" duplex call or one simplex call with an optional inbound RC
using a two frequency BS.
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2:1-mode: 2 traffic channel mode
NOTE: 2:1-mode supports two independent calls which may be either "MS to fixed end" duplex calls or simplex
calls using a two frequency BS.
backward: logical channel from target to source in direct mode
Base Station (BS): fixed end equipment that is used to obtain DMR services
bearer service: telecommunication service providing the capability for information transfer between access points
burst: elementary amount of bits within the physical channel
NOTE 1: Three different bursts exist with different number of bits. The Traffic burst contains 264 bits, the CACH
burst contains 24 bits and the RC burst contains 96 bits.
NOTE 2: The burst may include a guard time at the beginning and end of the burst used for power ramp-up and
ramp-down.
NOTE 3: For detailed burst definition see clause 4.2.1.
call: complete sequence of related transactions between MSs
NOTE: Transactions may be one or more bursts containing specific call related information.
Control plane (C-plane): part of the DMR protocol stack dedicated to control and data services
conventional: non-trunked communication
NOTE: This is a communication technique where any radio unit (MS) may communicate with one or more other
radio units (MSs) without using a trunking protocol, and may be either in direct mode or using any
additional equipment (e.g. BS).
Digital Mobile Radio (DMR): physical grouping that contains all of the mobile and/or fixed end equipment that is
used to obtain DMR services
direct mode: mode of operation where MSs may communicate outside the control of a network
NOTE: This is communication technique where any radio unit (MS) may communicate with one or more other
radio units (MSs) without the need for any additional equipment (e.g. BS).
duplex: mode of operation by which information can be transferred in both directions and where the two directions are
independent
NOTE: Duplex is also known as full duplex.
forward: logical channel from source to target in direct mode
frame: two contiguous time slots labelled 1 and 2
NOTE: A frame has a length of 60 ms.
Golay code: type of error correcting code named Golay
Hamming code: type of error correcting code named Hamming
inbound: MS to BS transmission
logical channel: distinct data path between logical endpoints
NOTE: The logical channels are labelled 1 and 2. The logical channel may consist of sub-channels,
e.g. SYNC, embedded signalling, etc.
Mobile Station (MS): physical grouping that contains all of the mobile equipment that is used to obtain DMR mobile
services
outbound: BS to MS transmission
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payload: bits in the information field
physical channel: RF carrier that is modulated with information bits of the bursts
NOTE: The RF carrier may be a single frequency or a duplex pair of frequencies. The physical channel of a DMR
subsystem is required to support the logical channels.
polite protocol: "Listen Before Transmit" (LBT) protocol
NOTE: This is a medium access protocol that implements a LBT function in order to ensure that the channel is
free before transmitting.
privacy: secret transformation
NOTE: Any transformation of transmitted information that is derived from a shared secret between the sender and
receiver.
Protocol Data Unit (PDU): unit of information consisting of protocol control information (signalling) and possibly
user data exchanged between peer protocol layer entities
Radio Frequency channel: radio frequency carrier (RF carrier)
NOTE: This is a specified portion of the RF spectrum. In DMR, the RF carrier separation is 12,5 kHz. The
physical channel may be a single frequency or a duplex spaced pair of frequencies.
Received Signal Strength Indication (RSSI): root mean squared (rms) value of the signal received at the receiver
antenna
Reed-Solomon code: type of error correcting code named Reed-Solomon
repeater mode: mode of operation where MSs may communicate through a BS
NOTE: This is a communication technique where any radio unit (MS) may communicate with one or more other
radio units (MSs) with the need for an intermediate BS.
Reverse Channel (RC): signalling burst from target to source
signalling: exchange of information specifically concerned with the establishment and control of connections, and with
management, in a telecommunication network
simplex: mode of working by which information can be transferred in both directions but not at the same time
superframe: 6 continuous traffic bursts on a logical channel labelled "A" to "F"
NOTE: A superframe has a length of 360 ms and is used for voice traffic only.
time slot (or slot): elementary timing of the physical channel
NOTE: A timeslot has a length of 30 ms and will be numbered "1" or "2".
transmission: transfer period of bursts containing information or signalling
NOTE: The transmission may be continuous, i.e. multiple bursts transmission without ramp-up, ramp-down, or
discontinuous, i.e. single burst transmission with ramp-up and ramp-down period.
Trellis code: type of error correcting code for modulation named Trellis
trunking: network controlled communication
NOTE: This is a communication technique where any radio unit (MS) may communicate with one or more other
radio units (MSs) using a trunking protocol and all MSs will be under control of a network.
User plane (U-plane): part of the DMR protocol stack dedicated to user voice services
vocoder socket: 216 bits vocoder payload
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3.2 Symbols
For the purposes of the present document, the following symbols apply:
dBm absolute power level relative to 1 mW, expressed in dB
dBp Power relative to the average power transmitted over a burst in decibel
Dibit 2 bits grouped together to represent a 4-level symbol
Eb Energy per bit
Nibble 4 bits grouped together
No Noise per Hz
Octet 8 bits grouped together, also called a byte
Tribit 3 bits grouped together into a symbol for a trellis code
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
4FSK Four-level Frequency Shift Keying
AI Air Interface
ARP Address Resolution Protocol
ARQ Automatic Retransmission request
AT Access Type
BER Bit Error Rate
BPTC Block Product Turbo Code
BS Base Station
NOTE: A reference designating a fixed end device.
CACH Common Announcement Channel
CC Colour Code
CCL Call Control Layer
C-plane Control plane
CR CRC bits
CRC Cyclic Redundancy Checksum for data error detection
CS CheckSum
CSBK Control Signalling BlocK
CSBKO CSBK Opcode
D_Sync general Data burst Sync
DBSN Data Block Serial Number
DD Defined Data format
DLL Data Link Layer
DMR Digital Mobile Radio
DPF Data Packet Format
DT Data Type field for General Data Bursts
EMB EMBedded signalling field
Enc_Dibit output Dibit from trellis Encoder
ERC European Radiocommunication Committee
ERM Electromagnetic compatibility and Radio spectrum Matters
FEC Forward Error Correction
FID Feature set ID
FLCO Full Link Control Opcode
FSM Finite State Machine
FSN Fragment Sequence Number
GF Galois Field to calculate parity checks for a RS code
GF(2) Galois Field with 2 elements
Golay Golay code parity check
H Hamming parity bits
HC Header Compression
H_Cx Hamming parity bit from Column x of a BPTC
H_Rx Hamming parity bit from Row x of a BPTC
HMSC High level Message Sequence Chart
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Hx Hamming parity bit for row x of a BPTC
I Information bit
ID IDentifier
IP Internet Protocol
LB Last Block
LBT Listen Before Transmit
LC Link Control
LCSS Link Control Start/Stop
LLID Logical Link ID
LSB Least Significant Bit
LSO Least Significant Octet
MAC Medium Access Control
MBC Multiple Block Control packets
MFID Manufacturer's FID
MS Mobile Station
NOTE: A reference designating a mobile or portable radio.
MSB Most Significant Bit
MSO Most Significant Octet
N_LC Null LC bit
P CACH Payload
PA Power Amplifier
PABX Private Automatic Branch eXchange
PC Parity Check bit
PDP Packet Data Protocol
PDU Protocol Data Unit
PF Protect Flag
PI Privacy Indicator
PL Physical Layer
POC Pad Octet Count
PR FILL Pseudo-Random Fill bits
PSTN Public Switched Telephone Network
QR Quadratic Residue code parity check bit
R Reserved bit
R_Sync Reverse channel Sync
RC Reverse Channel
RF Radio Frequency
rms root mean squared
RS Reed-Solomon code
RSSI Received Signal Strength Indication
SAP Service Access Point
NOTE: Where a network provides a service.
SAPID SAP Identifier
SDL Specification and Description Language
SFID Standards FID
SLCO Short Link Control Opcode
SYNC SYNChronization
TACT TDMA Access Channel Type
TC TDMA Channel
TCP Transmission Control Protocol
TDD Time Division Duplex
TDMA Time Division Multiple Access
Trellis_Dibit output Dibit from Trellis code
TX Transmitted bit
UDP User Datagram Protocol
UDT Unified Data Transport
U-plane User plane
V_Sync TDMA Voice burst Sync
VS Vocoder Socket bit
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4 Overview
The present document describes a Digital Mobile Radio (DMR) system for Tier I, Tier II and Tier III products which
employs a Time Division Multiple Access (TDMA) technology with a 2-slot TDMA solution and RF carrier bandwidth
of 12,5 kHz (see note 1).
NOTE 1: DMR system for Tier I products employs a continuous transmission variation of the above mentioned
technology.
The present document describes the Physical Layer (PL) and the Data Link Layer (DLL) of the DMR Air Interface
(AI). Radio equipments (fixed, mobile or portable) which conform to the present document shall be interoperable at the
Air Interface with equipment from other manufacturers.
Slot formats, field definitions, and timing are defined for voice traffic, data traffic, and control signalling. An overview
of the TDMA timing is provided followed by the basic slot formats and bit definitions. This is followed by definitions
of the payload and control fields. Finally, the details of the modulation and timing constraints are specified.
The present document will not provide the specification or operational detail for system implementations which include
but are not limited to trunking, roaming, network management, vocoder, security, data, subsystems interfaces and data
between private and public switched telephone networks. It describes only the appropriate access requirements
compatible with the Air Interface.
NOTE 2: The DMR standard consists of a multi-part deliverable, which will be referred to in the present document
if needed.
4.1 Protocol architecture
The purpose of this clause is to provide a model where the different functions and processes are identified and allocated
to different layers in the DMR protocol stack.
The protocol stack in this clause and all other related clauses describe and specify the interfaces, but these stacks do not
imply or restrict any implementation.
The DMR protocol architecture which is defined herein follows the generic layered structure, which is accepted for
reference description and specification of layered communication architectures.
The DMR standard defines the protocols for the following 3 layered model as shown in figure 4.1.
The base of the protocol stack is the Physical Layer (PL) which is the layer 1.
The Data Link Layer (DLL), which is the layer 2, shall handle sharing of the medium by a number of users. At the
DLL, the protocol stack shall be divided vertically into two parts, the User plane (U-plane), for transporting information
without addressing capability (e.g. voice), and the Control plane (C-plane) for signalling information, both control and
data, with addressing capability, as illustrated by figure 4.1.
NOTE 1: It is appropriate to bear in mind the different requirements of C-plane and U-plane information. C-plane
information needs only a discrete (or non-continuous) physical link to pass information although it needs
a continuous virtual link to support the service. This may also be called signalling or packet mode service.
Acknowledgements may or may not be requested. U-plane information, on the other hand, requires a
regular physical link to be available so that a constant delay service can be supported. This may also be
called circuit mode service.
NOTE 2: The DLL identified in figure 4.1 may be further sub-divided in the air interface protocol to separate the
functionality of Medium Access Control (MAC) and Logical Link Control (LLC), which is often
performed in radio air interface protocols due to the specialized nature of these two tasks. Such separation
is not presented in the present document and is implementation specific. It is further implementation
specific if layer 2 at U-plane offers only MAC for the service.
The Call Control Layer (CCL), which is layer 3, lies in the C-plane and is responsible for control of the call (addressing,
facilities, etc.), provides the services supported by DMR, and supports Short Data and Packet Data service. U-plane
access at layer 2 (DLL) supports voice service which is available in DMR. The Control Layer and the facilities and
services offered by DMR are described in TS 102 361-2 [5]. The Short Data and Packet Data Protocol offered by DMR
are described in TS 102 361-3 [12].
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AI Layer 2
AI Layer 1
Call Control Layer
Data Link Layer
Physical Layer
Voice payload
AI Layer 3
Control p
lane
User plane
Call Control information
Short Data service
Packet Data service
Figure 4.1: DMR protocol stack
4.1.1 Air Interface Physical Layer (layer 1)
The Air Interface layer 1 shall be the physical interface. It shall deal with the physical burst, composed of bits, which is
to be sent and/or received. The Physical Layer is described in clause 10.
The Air Interface layer 1 shall contain the following functions:
• modulation and demodulation;
• transmitter and receiver switching;
• RF characteristics;
• bits and symbol definition;
• frequency and symbol synchronization;
• burst building.
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4.1.2 Air Interface Data Link Layer (layer 2)
The Air Interface layer 2 shall handle logical connections and shall hide the physical medium from the upper layers.
The Data Link Layer is described in clauses 5 to 9.
The main functions are as follows:
• channel coding (FEC, CRC);
• interleaving, de-interleaving and bit ordering;
• acknowledgement and retry mechanism;
• media access control and channel management;
• framing, superframe building and synchronization;
• burst and parameter definition;
• link addressing (source and/or destination);
• interfacing of voice applications (vocoder data) with the PL;
• data bearer services;
• exchanging signalling and/or user data with the CCL.
4.1.3 Air Interface Call Control Layer (CCL) (layer 3)
Air Interface layer 3 (CCL) is applicable only to the C-plane, and shall be an entity for the services and facilities
supported by DMR on top of the layer 2 functionality. The Call Control Layer (CCL) is described in TS 102 361-2 [5]
and may have embedded intrinsic services associated to it.
The CCL provides the following functions:
• BS activation / deactivation;
• establishing, maintaining and terminating of calls;
• individual or group call transmission and reception;
• destination addressing (DMR IDs or gateway as appropriate);
• support of intrinsic services (emergency signalling, pre-emption, late entry, etc.);
• data call control;
• announcement signalling.
4.2 DMR TDMA structure
4.2.1 Overview of burst and channel structure
The described solution is based on a 2-slot TDMA structure.
The physical resource available to the radio system is an allocation of the radio spectrum. The radio spectrum allocation
shall be partitioned into Radio Frequency (RF) carriers with each RF carrier partitioned in time into frames and
timeslots.
A DMR burst is a period of RF carrier that is modulated by a data stream. A burst therefore represents the physical
channel of a timeslot. The physical channel of a DMR subsystem is required to support the logical channels.
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A logical channel is defined as a logical communication pathway between two or more parties. The logical channels
represent the interface between the protocol and the radio subsystem. The logical channels may be separated into two
categories:
• the traffic channels carrying speech or data information; and
• control channels carrying signalling.
A generalized timing diagram of exchanges between the MS and the BS is shown in figure 4.2 where the slots for the
two TDMA physical channels are labelled channel "1" and "2". Inbound transmission is labelled "MS TX" and
outbound transmission is labelled "BS TX". This diagram is intended to illustrate a number of signalling features and
timing relationships and does not represent a particular scenario.
11111122222212
11111122222221
MS TX
BS TX
Time
TDMA burst
(30 ms)
TDMA frame
(60 ms)
Guard time
CACH SYNC or
embedded signalling
111111222222121111112222221211111122222212
111111222222211111112222222111111122222221
MS TX
BS TX
TimeTime
TDMA burst
(30 ms)
TDMA frame
(60 ms)
Guard timeGuard time
CACHCACH SYNC or
embedded signalling
SYNC or
embedded signalling
NOTE: The example timing in figure 4.2 applies to a two frequency BS.
Figure 4.2: TDMA timing overview
Key points illustrated by the figure 4.2 include:
• While the BS is actively transmitting, the outbound channel is continuously transmitted, even if there is no
information to send. Transmission on the inbound channel is stopped when an MS has no information to
transmit.
• The inbound channel has an unused guard time between bursts to allow Power Amplifier (PA) ramping and
propagation delay.
• The outbound channel has a Common Announcement Channel (CACH) between bursts for traffic channel
management (framing and access) as well as low speed signalling.
• Bursts have either a synchronization pattern or an embedded signalling field located in the centre of the burst.
Placing the embedded signalling in the middle of a burst allows time for a transmitting MS to optionally
transition to the outbound channel and recover Reverse Channel (RC) information.
Other key points, summarized below but not limited to, are as follows:
• The centre of the inbound and outbound bursts shall be time aligned.
• The channel 1 and 2 bursts in the inbound channel are offset 30 ms in time from the channel 1 and 2 bursts in
the outbound channel. This number scheme allows a single channel identifier field in the outbound CACH to
use the same channel number when referring to the inbound and outbound channels.
• Different SYNC patterns are used in voice bursts and data bursts to allow the receiver to differentiate between
them. Different SYNC patterns are used for inbound and outbound channels to help the receiver reject
co-channel interference.
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• A Colour Code (CC) is present in the embedded signalling field and general data burst to provide a simple
means of distinguishing overlapping sites, in order to detect co-channel interference.
NOTE: The CC is not used for addressing (individual or group).
• The location of the SYNC bursts in channel 1 is independent from the location of the SYNC bursts in
channel 2. The location of SYNC bursts in the inbound channels is independent from the location of the SYNC
bursts in the outbound channels.
• Voice transmissions use a superframe that is 6 bursts (360 ms) long with bursts labelled "A" to "F". Each
superframe starts with a voice synchronization pattern in burst A.
• Data and control do not have a superframe structure. These bursts may contain a synchronization pattern and
may also carry embedded signalling, such as RC, when required.
4.2.2 Burst and frame structure
The generic burst structure consists of two 108-bit payload fields and a 48-bit synchronization or signalling field as
shown in figure 4.3. Each burst has a total length of 30 ms but 27,5 ms are used for the 264 bits content, which is
sufficient to carry 60 ms of compressed speech, using 216 bits payload.
30,0 ms
SYNC or
embedded
signalling
27,5 ms
5,0 ms
PayloadPayload
108 bits 108 bits
48 bits
264 bits
30,0 ms30,0 ms
SYNC or
embedded
signalling
27,5 ms27,5 ms
5,0 ms5,0 ms
PayloadPayload
108 bits108 bits 108 bits108 bits
48 bits48 bits
264 bits264 bits
Figure 4.3: Generic burst structure
For example, for a vocoder that uses 20 ms vocoder frames, the burst will carry three 72-bit vocoder frames
(including FEC) plus a 48-bit synchronization word in a voice burst, that is 264 bits (27,5 ms) used for the burst
contents.
NOTE: For data and control information the payload is reduced to two 98-bit payload which left a 20-bit field for
additional Data Type field definition, as described in clause 6.2.
The centre of each burst has a field that carries either synchronization or embedded signalling. This field is placed in the
middle of a burst to support RC signalling (see clause 5.1.5).
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On the inbound channel, the remaining 2,5 ms is used for guard time to allow for PA ramping and propagation delay, as
shown in figure 4.4 for an inbound frame.
TDMA
burst
center
SYNC or
embedded
signalling
PayloadPayload
TDMA
burst
center
SYNC or
embedded
signalling
PayloadPayload
30,0 ms 30,0 ms
TDMA frame
Timeslot 1 Timeslot 2
2,5 ms
TDMA
burst
center
SYNC or
embedded
signalling
PayloadPayloadPayload
TDMA
burst
center
SYNC or
embedded
signalling
PayloadPayload
30,0 ms30,0 ms 30,0 ms30,0 ms
TDMA frameTDMA frame
Timeslot 1 Timeslot 2
2,5 ms2,5 ms
Figure 4.4: MS sourced TDMA frame
On the outbound channel, this 2,5 ms is used for a Common Announcement Channel (CACH) that carries TDMA frame
numbering, channel access indicators, and low speed signalling as shown in figure 4.5 for an outbound frame.
SYNC or
embedded
signalling
PayloadPayload
SYNC or
embedded
signalling
Payload
Payload
TDMA
burst
center
TDMA
burst
center
CACH
burst
center
CACHCACH
CACH
CACH
CACH
CACH
30,0 ms 30,0 ms
TDMA frame
Timeslot 1 Timeslot 2
2,5 ms
SYNC or
embedded
signalling
PayloadPayload
SYNC or
embedded
signalling
Payload
Payload
TDMA
burst
center
TDMA
burst
center
CACH
burst
center
CACHCACHCACHCACH
CACH
CACHCACHCACH
CACH
CACH
30,0 ms30,0 ms 30,0 ms30,0 ms
TDMA frameTDMA frame
Timeslot 1 Timeslot 2
2,5 ms2,5 ms
Figure 4.5: BS sourced TDMA frame
4.3 Frame synchronization
Frame SYNChronization (SYNC) is provided by a special sequence of bits that mark the location of the centre of a
TDMA burst. Receivers may use a matched filter to achieve initial synchronization, using the output of a matched
correlator to initialize the symbol recovery parameters to compensate for frequency and deviation errors as well as
determine the centre of the burst. Once the receiver is synchronized to a channel, it may use pattern matching to detect
the presence of SYNC to verify that the channel is still present and determine the type of SYNC to identify the contents
of the burst. Multiple SYNC patterns are used to:
• differentiate voice bursts from data/control bursts and from RC bursts;
• differentiate inbound channels from outbound channels.
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To accomplish this, the following SYNC patterns have been defined (see clause 9.1.1 for details and bit patterns for the
frame SYNC):
• BS sourced voice;
• BS sourced data;
• MS sourced voice;
• MS sourced data;
• MS sourced standalone RC.
For all two frequency BS channel inbound transmissions and all single frequency channel transmissions, the first burst
shall contain a synchronization pattern to allow the target receiver to detect the presence of the signal, achieve bit
synchronization, and determine the centre of the burst. Follow-on bursts contain either SYNC or embedded signalling
depending on the burst type and the context.
For all two frequency BS channel outbound transmissions, it is assumed that the MS is already synchronized to the
outbound channel well before the start of any transmissions directed towards it. Therefore, there is no requirement that
the voice header shall contain a synchronization pattern.
NOTE 1: Not having to place the SYNC pattern in the voice header removes the need for the voice outbound
transmission to be delayed for the case where a voice header coincides with the embedded outbound RC
position which is fixed (see clause 5.1.5.1).
NOTE 2: A SYNC pattern is always required in the data header and voice burst A, therefore the outbound
transmission has to be delayed by a burst where either a data header or voice burst A would otherwise
coincide with the embedded outbound RC position.
For data and control messages, the embedded field shall be only a data SYNC pattern or RC signalling
(see clauses 5.1.5.1 and 5.1.5.2). For voice calls, the voice SYNC pattern occurs in the first burst of every voice
superframe. In addition to marking the superframe boundaries, periodically inserting these periodic syncs allow late
entry receivers to pick up voice messages after the transmission has started. See clause 5.1.2.1 for details on the
superframe structure.
Figure 4.6 illustrates the best case and worst-case synchronization period for an inbound (MS to BS) TDMA channel.
Since data and control messages contain a frame synchronization field in each burst, SYNC opportunities can occur as
frequently as every 60 ms. During a voice call, SYNC opportunities occur every 360 ms, the length of a voice
superframe. The first burst of every inbound transmission shall contain a SYNC pattern in order to allow the target to
detect and synchronize to the transmission.
Data Data
Time
Voice Voice Voice Voice Voice Voice Voice
60 ms 360 ms
Data
SYNC
Voice
SYNC
Data
SYNC
Voice
SYNC
DataData DataData
TimeTime
VoiceVoice Voice Voice Voice Voice Voice VoiceVoice
60 ms 360 ms
Data
SYNC
Data
SYNC
Voice
SYNC
Voice
SYNC
Data
SYNC
Data
SYNC
Voice
SYNC
Voice
SYNC
Figure 4.6: Inbound synchronization timing
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Figure 4.7 illustrates the best case and worst-case synchronization period for an outbound (BS to MS) TDMA channel.
Because an outbound channel is continuously keyed, both TDMA channels always contain some type of signalling. In
addition, since the target MS can receive both TDMA slots, the target MS can detect SYNC in either slot. Because data
and control messages will typically contain a frame synchronization field in each burst, SYNC opportunities can occur
as frequently as every 30 ms. During a voice call, SYNC opportunities occur every 360 ms, the length of a voice
superframe, on each channel.
Figure 4.7 illustrates the worst-case SYNC timing for voice, 330 ms, which occurs when two voice calls are active and
their superframes (for details of superframes see clause 5.1.2.1) are offset by 30 ms.
Based on these assumptions, the time between SYNC opportunities can be as short as 30 ms and as long as 330 ms.
Data Data
Voice
SYNC
Voice
SYNC
Time
Data
SYNC
Data
SYNC
Voice
SYNC
Voice
SYNC
Data Voice Voice Voice Voice Voice Voice VoiceVoice Voice Voice Voice Voice Voice Voice
30 ms 30 ms330 ms
Data DataData
Voice
SYNC
Voice
SYNC
Voice
SYNC
Voice
SYNC
TimeTime
Data
SYNC
Data
SYNC
Voice
SYNC
Voice
SYNC
Voice
SYNC
Data Voice Voice Voice Voice Voice Voice VoiceVoiceVoice Voice Voice Voice Voice Voice VoiceVoice
30 ms 30 ms330 ms30 ms 30 ms330 ms
Figure 4.7: Outbound synchronization timing
4.4 Timing references
4.4.1 Repeater mode BS established timing relationship
When operating with a BS, a MS shall synchronize to an outbound channel and base its inbound timing entirely on the
outbound timing. This insures that all MS units are working off of the same timing reference. If the BS is not currently
transmitting, a MS wishing to access the system shall send a "BS activation" signalling to the BS asynchronously and
wait for the outbound channel to be established before synchronizing and continuing with further transmission
(see TS 102 361-2 [5]).
4.4.2 Repeater mode MS established timing relationship
When operating with a BS, it is also possible to have BSs that are able to transmit their outbound channel in a way that
is synchronized with an MS inbound channel avoiding the "BS activation" procedure. Also this BS behaviour insures
that all MS units are working off of the same timing reference.
4.4.3 Direct mode timing relationship
In direct mode, the transmitting MS shall establish the timing reference. Any MS wishing to send RC signalling back to
the source shall synchronize to the forward path and shall base their RC timing on the forward path timing. Once the
source MS stops transmitting, any other MS wishing to transmit shall begin sending information asynchronously and
establish a new and independent time reference.
NOTE: RC signalling applies only for Tier II and Tier III products.
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4.5 Common Announcement Channel (CACH)
While the inbound channel requires an unused guard time between bursts to allow PA ramping and propagation delay,
the outbound channel from the BS shall transmit continuously after BS activation and utilize this small segment for
additional signalling. A Common Announcement Channel (CACH) is defined between the outbound bursts and is used
for channel management (framing and access) as well as for low speed signalling.
One purpose of the CACH is to indicate the usage of the inbound channel. Since a two frequency BS is full-duplex it
transmits simultaneously while it is receiving and shall send status information to all of the listening MS units about the
channel status (idle or busy) of the inbound channel. When a MS unit wishes to transmit a data message, it shall wait
until the inbound channel is flagged as Channel State Idle (CS_Idle) before it transmits.
Figure 4.8 shows the timing relationship between a particular CACH burst and its corresponding inbound burst. Each
CACH burst indicates the status of the inbound burst delayed by one slot to allow the receiver time to receive the
CACH, decode the information, decide what action to take, and transition to transmit mode. In the example shown, the
CACH burst preceding outbound channel 2 bursts indicates the status of the burst in inbound channel 2.
NOTE: This timing relationship is based on the shortest time period that can be used in practice.
CACH
11111122222212
11111122222221
CACH indicates inbound channel availability
Time
MS TX
BS TX
CACH
11111122222212
11111122222221
CACH indicates inbound channel availability
TimeTime
MS TX
BS TX
MS TX
BS TX
Figure 4.8: Access type indicator timing
A second purpose of the CACH is to indicate the channel number of the inbound and outbound bursts as illustrated in
figure 4.9. Each CACH burst defines the channel number for the outbound burst immediately following and the inbound
burst delayed by one slot. In the example shown, the CACH burst indicates the position of inbound channel 2 and
outbound channel 2.
11111122222212
11111122222221
CACH
CACH indicates inbound channel number
CACH indicates outbound channel number
Time
MS TX
BS TX
11111122222212
11111122222221
CACH
CACH indicates inbound channel number
CACH indicates outbound channel number
TimeTime
MS TX
BS TX
MS TX
BS TX
Figure 4.9: CACH channel indicator timing
A third purpose of the CACH is to carry additional low speed signalling as described in clause 7.1.4.
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ETSI TS 102 361
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24
4.6 Basic channel types
4.6.1 Traffic channel with CACH
The traffic channel with CACH is shown in figure 4.10. This channel type shall be used for outbound transmissions
from a two frequency BS to a MS. The channel consists of two TDMA traffic channels (channels 1 and 2) as well as a
CACH for channel numbering, channel access, and low speed data. This channel is transmitted continuously without
gaps as long as the BS is activated.
If no information is available to transmit in channel 1 and/or channel 2, the BS shall transmit Idle messages to fill out
the bursts (see clause 7.3).
If no CACH payload is available to transmit, Null message Short LCs shall be send as defined in TS 102 361-2 [5]. For
the transmission of Null message Short LC in CACH see clause 7.1.4.
NOTE: This channel type should also be used for continuous transmission mode between MS units.
CACH
12111111122222221
CACHCACH
1211111112222222112111111122222221
Figure 4.10: Traffic channel with CACH
4.6.2 Traffic channel with guard time
The traffic channel with guard time is shown in figure 4.11. This channel type shall be used for inbound transmissions
from a MS to a two frequency BS (see note). The channel consists of two TDMA traffic channels (channels 1 and 2)
separated by a guard time to allow PA ramping and propagation delay. Three use cases are shown for this channel type:
Use Case 1: Both channels utilized for traffic (see note).
Use Case 2: A single channel (channel 1) utilized for traffic.
Use Case 3: One channel utilized for traffic (channel 2) while the other is used for short standalone RC bursts
(channel 1).
NOTE: The first use case should also be used for communication via a single frequency BS where the Forward
channel is MS to BS and the Backward channel is BS to MS.
Both channels utilized for traffic
Single channel utilized for traffic
One channel utilized for traffic, one utilized for Reverse Channel
Guard
UnusedTraffic
12111111122222221
12111111122222221
12111111122222221
Traffic RC
Both channels utilized for traffic
Single channel utilized for traffic
One channel utilized for traffic, one utilized for Reverse Channel
GuardGuardGuard
UnusedTraffic UnusedUnusedTrafficTraffic
1211111112222222112111111122222221
1211111112222222112111111122222221
1211111112222222112111111122222221
Traffic RCTrafficTraffic RCRC
Figure 4.11: Traffic channel with guard time
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4.6.3 Bi-directional channel
The bi-directional channel is shown in figure 4.12. This channel type is used for direct mode communication between
MS units. The channel consists of a Forward and a Backward TDMA traffic channels on the same frequency separated
by guard times. Three use cases are shown for this channel type:
Use Case 1: Both physical channels utilized for duplex traffic (Forward and Backward).
Use Case 2: A single physical channel (Forward) utilized for traffic.
Use Case 3: One channel utilized for traffic (Forward) while the other is used for short RC signalling (Reverse).
Forward Forward Forward Forward Forward Forward Forward Forward
Backward Backward Backward Backward Backward Backward Backward Backward
Forward
Forward Forward Forward Forward Forward Forward Forward Forward Forward
Forward Forward Forward Forward Forward Forward Forward Forward Forward
Reverse Reverse Reverse Reverse Reverse Reverse Reverse Reverse
Both channels utilized for traffic
Single channel utilized for traffic
One channel utilized for traffic, one utilized for Reverse Channel
Backward Backward Backward Backward Backward Backward Backward Backward
Forward Forward Forward Forward Forward Forward Forward Forward
Backward Backward Backward Backward Backward Backward Backward BackwardBackward Backward Backward Backward Backward Backward Backward Backward
Forward
Forward Forward Forward Forward Forward Forward Forward Forward ForwardForward Forward Forward Forward Forward Forward Forward Forward Forward
Forward Forward Forward Forward Forward Forward Forward Forward ForwardForward Forward Forward Forward Forward Forward Forward Forward Forward
Reverse Reverse Reverse Reverse Reverse Reverse Reverse ReverseReverse Reverse Reverse Reverse Reverse Reverse Reverse Reverse
Both channels utilized for traffic
Single channel utilized for traffic
One channel utilized for traffic, one utilized for Reverse Channel
Backward Backward Backward Backward Backward Backward Backward BackwardBackward Backward Backward Backward Backward Backward Backward Backward
Figure 4.12: Bi-directional channel
5 Layer 2 protocol description
The following clauses describe the layer 2 protocol and define the operation of the Data Link Layer (DLL) of the DMR
Air Interface (AI). The protocol description is made in terms of the timing relationship and the channel access rules.
5.1 Layer 2 timing
5.1.1 Channel timing relationship
The channel designation of "1" and "2" refer to logical channels that have a strictly defined relationship. The inbound
channel 1 and 2 bursts are offset in time from the outbound channel 1 and 2 bursts. Various call types and services can
require specific timing relationships between the inbound and outbound channels which lead to the definition of a
number of logical channels.
Voice and data sessions require both an inbound channel and an outbound channel. The timing relationship between the
inbound channel and the outbound channel can be either aligned in time (aligned channels) or non-aligned (offset
channels) as described in clauses 5.1.1.1 and 5.1.1.2 of the present document. MSs must be aware if aligned channel
timing or offset channel timing is expected by the BS. The logical channel relationship to the inbound and outbound
channels for both aligned channel timing and offset channel timing shall conform to table 5.1.
Table 5.1: Logical channel relationship to inbound and outbound channels
Channel Timing Logical Channel Inbound Channel (MS TX) Outbound Channel (BS TX)
1 2 1 Aligned
2 1 2
1 1 1 Offset
2 2 2
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5.1.1.1 Aligned channel timing
Aligned timing supports RC signalling by providing the receiving MS with a RC transmit opportunity on the inbound
channel without missing any of its outbound traffic. The example in figure 5.1 illustrates transmissions on logical
channel 1, which consists of inbound channel 2 and outbound channel 1. Therefore an MS provisioned to only receive
on logical channel 1 shall receive on outbound channel 1 and shall transmit on inbound channel 2 when the BS channel
timing is aligned. Likewise, an MS provisioned to only receive on logical channel 2 shall receive on outbound channel 2
and shall transmit on inbound channel 1 when the BS channel timing is aligned.
1111112 2 2 2 2 212
11111122222221
MS TX
BS TX
Time
1111112 2 2 2 2 212
11111122222221
MS TX
BS TX
TimeTime
Figure 5.1: Aligned channel timing
Aligned timing also supports "MS to MS" duplex traffic by allowing a MS to transmit in one timeslot and receive the
repeated transmission of the other MS on the alternative timeslot.
NOTE: MS to MS timing requirements apply when communicating through a BS.
5.1.1.2 Offset channel timing
Offset timing supports "MS to fixed end" duplex traffic by allowing a MS to transmit in one time slot and receive the
fixed end transmission on the alternate time slot. The example in figure 5.2 illustrates transmissions on logical
channel 1, which consists of inbound channel 1 and outbound channel 1. Therefore an MS provisioned to only receive
on logical channel 1 shall receive on outbound channel 1 and shall transmit on inbound channel 1 when the BS channel
timing is offset. Likewise, an MS provisioned to only receive on logical channel 2 shall receive on outbound channel 2
and shall transmit on inbound channel 2 when the BS channel timing is offset.
1111112 2 2 2 2 212
11111122222221
MS TX
BS TX
Time
1111112 2 2 2 2 212
11111122222221
MS TX
BS TX
TimeTime
Figure 5.2: Offset channel timing
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27
5.1.2 Voice timing
5.1.2.1 Voice superframe
Vocoder frames shall be transmitted using a six burst, 360 ms, superframe as shown in figure 5.3. Complete TDMA
superframes are repeated for the duration of the voice message. The bursts of a superframe are designated with letters
"A" through "F". Burst A marks the start of a superframe and always contains a voice SYNC pattern. Bursts B to F
carry embedded signalling in place of the SYNC pattern.
Embedded
Voice
Voice
Voice
Voice
VoiceVoice
Voice
Voice
Voice SYNC
A
Embedded
C
Embedded
E
Voice
Voice SYNC
A
Embedded
BB
Embedded
Embedded
FF
Embedded
D
Voice superframe = 360 ms
Embedded
Voice
Voice
Voice
Voice
VoiceVoice
Voice
Voice
Voice SYNC
A
Embedded
C
Embedded
E
Voice
Voice SYNC
A
Embedded
BB
Embedded
Embedded
FF
Embedded
D
Voice superframe = 360 ms
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoiceVoiceVoice
VoiceVoice
VoiceVoice
Voice SYNC
A
Embedded
C
Embedded
E
VoiceVoice
Voice SYNCVoice SYNC
A
Embedded
BB
Embedded
Embedded
FF
Embedded
D
Voice superframe = 360 msVoice superframe = 360 ms
Figure 5.3: Voice superframe
5.1.2.2 Voice initiation
For conventional systems the first burst A of a voice transmissions and a repeated voice transmission shall only be
immediately preceded by a voice LC header or a PI header. The sequence of information during voice initiation with
only a voice LC header is shown in figure 5.4. The voice message begins with a voice LC header burst, and then
continues with voice superframes. Details of the LC header are given in clause 7.1.
Voice
Voice
Voice
Voice
VoiceVoice
LC
Hdr
Voice
ACE
Voice
ABBF
D
Voice superframe = 360 ms
Time
Voice
Voice
Voice
Voice
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoiceVoiceVoice
LC
Hdr
LC
Hdr
VoiceVoice
ACE
Voice
ABBF
D
Voice superframe = 360 msVoice superframe = 360 ms
TimeTime
Figure 5.4: Voice initiation with LC header
In trunked systems voice may be transmitted without any preceding header as shown in figure 5.5. Other MS units on
the traffic channel can determine the source and destination groups/units based on trunking control signalling.
NOTE 1: Not having to transmit the preceding header allows the initial speech delay to be reduced. However, MSs
and BSs will only be permitted to omit the preceding header if this feature is supported by the system
configuration.
NOTE 2: Using a preceding LC header in trunked systems is optional.
Voice
Voice
Voice
Voice
VoiceVoice
Voice
ACE
Voice
ABBF
D
Voice superframe = 360 ms
Time
Voice
Voice
Voice
Voice
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoiceVoiceVoice
VoiceVoice
ACE
Voice
ABBF
D
Voice superframe = 360 msVoice superframe = 360 ms
TimeTime
Figure 5.5: Voice initiation without header
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For conventional systems a voice LC header shall be sent and a PI header may be sent at the beginning of the voice
transmission as illustrated in figure 5.6. In this case, the voice LC header shall precede the PI header.
Voice
Voice
Voice
VoiceVoice
PI
Hdr
Voice
ACE
Voice
ABF
D
Voice superframe = 360 ms
Time
LC
Hdr
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoiceVoiceVoice
PI
Hdr
Voice
ACE
Voice
ABF
D
Voice superframe = 360 ms
Time
LC
Hdr
Figure 5.6: Voice initiation with LC and PI header
For trunked systems a PI header may be sent at the beginning of the voice transmission to indicate privacy status and
properly initialize any privacy functions. The sequence of information is shown in figure 5.7. To support late entry,
additional privacy information may be interleaved throughout the voice message.
Voice
Voice
Voice
Voice
VoiceVoice
PI
Hdr
Voice
ACE
Voice
ABBF
D
Voice superframe = 360 ms
Time
Voice
Voice
Voice
Voice
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoiceVoiceVoice
PI
Hdr
PI
Hdr
VoiceVoice
ACE
Voice
ABBF
D
Voice superframe = 360 msVoice superframe = 360 ms
TimeTime
Figure 5.7: Voice initiation with PI header
5.1.2.3 Voice termination
Voice transmission speech items shall be terminated by sending a general data burst with a data SYNC pattern instead
of a voice SYNC pattern in the burst immediately following the end of a voice superframe. This is illustrated in
figure 5.8.
NOTE 1: For an inbound (two or single frequency) BS channel and direct mode a terminator with LC is used for
the general data burst. In all other cases, the voice termination with LC may be used in the general data
burst.
Voice
Voice
Voice
Voice
VoiceVoiceVoice
ACEFB F
Data/
Cntrl
D
Voice
E
Voice superframe = 360 ms
Time
Voice SYNC
Data SYNC
Voice
Voice
Voice
Voice
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoiceVoiceVoiceVoiceVoice
ACEFB F
Data/
Cntrl
Data/
Cntrl
D
VoiceVoice
E
Voice superframe = 360 ms
TimeTime
Voice SYNCVoice SYNC
Data SYNCData SYNC
Figure 5.8: Voice termination
Since the data SYNC is sufficient to indicate the end of a voice transmission speech item, any general data burst shall
work as a terminator message.
NOTE 2: It is up to the implementation whether to process the data burst or use the SYNC as terminator.
5.1.3 Data timing
The present document defines single slot and dual slot data transmission modes. The differences between these two
modes are only the bit rate offered to upper layers of the DMR stack leaving unchanged the format of the carried
messages.
NOTE: It is a function of system implementation which data transmission modes are used.
ETSI
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5.1.3.1 Single slot data timing
Figure 5.9 illustrates one example of timing for single slot inbound data transmission. The single slot data transmission
shall be initiated with one or two data headers that contain addressing as well as information about the payload. These
headers are followed by one or more data blocks. The last block in the transmission terminates the entire data message
transfer. A complete description of the data transmission possibilities will be presented in TS 102 361-3 [12].
Figure 5.9 illustrates an exchange between a MS and the infrastructure where a single data header is required.
Hdr
Data
Block
Data
Block
Data
Block
Data
Block
Last
Block
Hdr
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Last
Block
Last
Block
Figure 5.9: Single header data timing
Figure 5.10 illustrates a single slot inbound data transmission exchange between two MS for which two data headers are
required.
Last
Block
Data
Block
Hdr
Hdr
Data
Block
Data
Block
Data
Block
Last
Block
Last
Block
Data
Block
Data
Block
HdrHdr
HdrHdr
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Figure 5.10: Dual header data timing
The single slot data transmission mode is applicable to:
• direct channels; or
• single frequency repeater; or
• 1:1 repeater systems with RC; or
• 1:1 repeater systems with no RC; or
• 2:1 repeater systems.
5.1.3.2 Dual slot data timing
Figure 5.11 illustrates the timing for an outbound dual slot data occurrences. This example illustrates a transmission
initiated with one data header. The header is followed by one or more data blocks (twelve in this example). The last
block in the transmission contains payload and CRC to verify that the entire data message was successfully transferred.
NOTE: A complete description of the data transmission possibilities will be presented in TS 102 361-3 [12].
1111112222221
Last
Block
Data
Block
Hdr
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
1111112222221
Last
Block
Data
Block
Hdr
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Figure 5.11: Dual slot data timing
The dual slot data transmission mode is applicable to:
• direct channels; or
• 1:1 repeater systems with no RC.
ETSI
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5.1.4 Traffic timing
5.1.4.1 BS timing
The following figures illustrate example timings for repeated traffic. The repeat delay will be based on the type of
logical channel used (offset or aligned channels) as well as the ability of the BS to process the information.
NOTE: Some BS or system implementations can result in longer timing delays than those shown in the following
examples.
Figure 5.12 shows an example timing diagram for repeated traffic using aligned traffic channels. In this example, the
MS transmits on inbound channel 2 and receive on outbound channel 1. Consequently, there is an inherent 60 ms delay
in the repeat path.
11111122222212
11111122222221
Time
MS TX
BS TX
TX
2
TX
3
TX
4
TX
5
TX
6
TX
7
TX
8
Repeat
1
Repeat
2
Repeat
3
Repeat
4
Repeat
5
Repeat
6
Repeat
7
60 ms delay
11111122222212
11111122222221
TimeTime
MS TX
BS TX
MS TX
BS TX
TX
2
TX
2
TX
3
TX
3
TX
4
TX
4
TX
5
TX
5
TX
6
TX
6
TX
7
TX
7
TX
8
TX
8
Repeat
1
Repeat
2
Repeat
3
Repeat
4
Repeat
5
Repeat
6
Repeat
7
Repeat
1
Repeat
1
Repeat
2
Repeat
2
Repeat
3
Repeat
3
Repeat
4
Repeat
4
Repeat
5
Repeat
5
Repeat
6
Repeat
6
Repeat
7
Repeat
7
60 ms delay
Figure 5.12: Aligned channels BS timing
Figures 5.13 and 5.14 show example timing diagrams for repeated traffic using Offset traffic channels. In these
examples, the MS transmit on the inbound channel 2 and listen to the outbound channel 2. If the BS is capable of
processing the inbound traffic and repeating it on the next outbound slot, there will be a 30 ms delay in the repeat path
as shown in figure 5.13.
11111122222212
11111122222221
Time
MS TX
BS TX
TX
2
TX
3
TX
4
TX
5
TX
6
TX
7
TX
8
Repeat
1
Repeat
2
Repeat
3
Repeat
4
Repeat
5
Repeat
6
Repeat
7
30 ms delay
11111122222212
11111122222221
TimeTime
MS TX
BS TX
MS TX
BS TX
TX
2
TX
2
TX
3
TX
3
TX
4
TX
4
TX
5
TX
5
TX
6
TX
6
TX
7
TX
7
TX
8
TX
8
Repeat
1
Repeat
1
Repeat
2
Repeat
2
Repeat
3
Repeat
3
Repeat
4
Repeat
4
Repeat
5
Repeat
5
Repeat
6
Repeat
6
Repeat
7
Repeat
7
30 ms delay
Figure 5.13: Offset channels repeated voice timing - 30 ms delay
ETSI
ETSI TS 102 361
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.5 (2007
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31
If the BS is not capable of processing the inbound traffic and repeating it on the next outbound slot, there will be at least
a 90 ms delay in the repeat path as shown in figure 5.14.
11111122222212
11111122222221
Time
MS TX
BS TX
TX
3
TX
4
TX
5
TX
6
TX
7
TX
8
TX
9
Repeat
1
Repeat
2
Repeat
3
Repeat
4
Repeat
5
Repeat
6
Repeat
7
90 ms delay
11111122222212
11111122222221
TimeTime
MS TX
BS TX
MS TX
BS TX
TX
3
TX
3
TX
4
TX
4
TX
5
TX
5
TX
6
TX
6
TX
7
TX
7
TX
8
TX
8
TX
9
TX
9
Repeat
1
Repeat
2
Repeat
3
Repeat
4
Repeat
5
Repeat
6
Repeat
7
Repeat
1
Repeat
1
Repeat
2
Repeat
2
Repeat
3
Repeat
3
Repeat
4
Repeat
4
Repeat
5
Repeat
5
Repeat
6
Repeat
6
Repeat
7
Repeat
7
90 ms delay
Figure 5.14: Offset channels repeated voice timing - 90 ms delay
5.1.4.2 Single frequency BS timing
Figure 5.15 illustrates an example timing diagram for a single frequency BS. In this example, the MS transmits on the
inbound channel, which is one of the TDMA physical channels. The BS re-transmits the outbound voice on the alternate
TDMA channel.
Repeat
1
Repeat
2
Repeat
3
Repeat
4
Repeat
5
Repeat
6
Repeat
7
TX
3
TX
4
TX
5
TX
6
TX
7
TX
8
TX
9
BS TX
Outbound Outbound Outbound Outbound Outbound Outbound Outbound
MS TX
Time
Inbound Inbound Inbound Inbound Inbound Inbound Inbound
Repeat
1
Repeat
2
Repeat
3
Repeat
4
Repeat
5
Repeat
6
Repeat
7
Repeat
1
Repeat
1
Repeat
2
Repeat
2
Repeat
3
Repeat
3
Repeat
4
Repeat
4
Repeat
5
Repeat
5
Repeat
6
Repeat
6
Repeat
7
Repeat
7
TX
3
TX
4
TX
5
TX
6
TX
7
TX
8
TX
9
TX
3
TX
3
TX
4
TX
4
TX
5
TX
5
TX
6
TX
6
TX
7
TX
7
TX
8
TX
8
TX
9
TX
9
BS TX
Outbound Outbound Outbound Outbound Outbound Outbound Outbound
MS TX
TimeTime
Inbound Inbound Inbound Inbound Inbound Inbound Inbound
Figure 5.15: Single frequency BS timing
If the BS is not capable of processing the inbound traffic and repeating it on the next outbound slot, there will be a
3 burst (90 ms) delay in the repeat path as shown.
5.1.4.3 Direct mode timing
Figure 5.16 illustrates an example timing diagram for direct mode traffic. In this example, the MS transmits on the
forward channel, which is one of the TDMA physical channels.
TX
3
TX
4
TX
5
TX
6
TX
7
TX
8
TX
9
Forward Forward Forward Forward Forward Forward Forward
Backward Backward Backward Backward Backward Backward Backward
MS TX
Time
TX
3
TX
4
TX
5
TX
6
TX
7
TX
8
TX
9
TX
3
TX
3
TX
4
TX
4
TX
5
TX
5
TX
6
TX
6
TX
7
TX
7
TX
8
TX
8
TX
9
TX
9
Forward Forward Forward Forward Forward Forward Forward
Backward Backward Backward Backward Backward Backward Backward
MS TX
TimeTime
Figure 5.16: Direct mode timing
ETSI
ETSI TS 102 361
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1 V1.4.5 (2007
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32
5.1.4.4 Time Division Duplex (TDD) timing
Figure 5.17 shows an example timing diagram for TDD (duplex) voice. In this example, the MS transmits voice on
inbound channel 2 and listen to voice on the outbound channel 2.
11111122222212
11111122222221
Time
MS TX
BS TX
Voice Voice Voice Voice Voice Voice Voice
Voice Voice Voice Voice Voice Voice Voice
Outbound Outbound Outbound Outbound Outbound Outbound Outbound
Inbound Inbound Inbound Inbound Inbound Inbound Inbound
11111122222212
11111122222221
TimeTime
MS TX
BS TX
MS TX
BS TX
VoiceVoice VoiceVoice VoiceVoice VoiceVoice VoiceVoice VoiceVoice VoiceVoice
Voice Voice Voice Voice Voice Voice VoiceVoiceVoice VoiceVoice VoiceVoice VoiceVoice VoiceVoice VoiceVoice VoiceVoice
Outbound Outbound Outbound Outbound Outbound Outbound Outbound
Inbound Inbound Inbound Inbound Inbound Inbound Inbound
Figure 5.17: TDD voice timing
5.1.4.5 Continuous transmission mode
The format for Continuous Transmission uses the "Traffic Channel with CACH" defined in clause 4.6.1. In this mode,
however, two traffic channels and the CACH are transmitted by a MS instead of a BS. In order to completely fill the
channel, identical traffic is sent on both channel 1 and channel 2. Link Control signalling can be sent via the CACH if
desired. Since there is no BS, only MS sourced SYNC patterns are used.
An example of continuous transmission for voice is illustrated in figure 5.18. This example shows a call initiated on
channel 1 using an LC header, lasting a single voice superframe, and ending with a Terminator with LC. Voice traffic is
sent using the inbound voice superframe defined in clause 5.1.2.1. Identical traffic is sent one burst later in channel 2 as
shown.
VoiceVoiceVoiceVoiceVoiceVoice VoiceVoiceVoiceVoiceVoiceVoice
ACEBFDACEBFD
111111 22222221
Term Term
LC
Hdr
LC
Hdr
12
VoiceVoiceVoiceVoiceVoiceVoiceVoiceVoiceVoiceVoiceVoiceVoice VoiceVoiceVoiceVoiceVoiceVoiceVoiceVoiceVoiceVoiceVoiceVoice
ACEBFDACEBFD
111111 22222221
TermTerm TermTerm
LC
Hdr
LC
Hdr
LC
Hdr
LC
Hdr
12
Figure 5.18: Continuous transmission mode for voice
An example of continuous transmission for data is illustrated in figure 5.19. This example shows a data transaction on
channel 1 initiated, lasting five data blocks, and ending with a Last Data Block. Identical traffic is sent one burst later in
channel 2 as shown.
111111 22222221
Last
Block
Data
Block
Hdr
Data
Block
Data
Block
Data
Block
Data
Block
Last
Block
Data
Block
Hdr
Data
Block
Data
Block
Data
Block
Data
Block
111111 22222221
Last
Block
Last
Block
Data
Block
Data
Block
HdrHdr
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Last
Block
Last
Block
Data
Block
Data
Block
HdrHdr
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Data
Block
Figure 5.19: Continuous transmission mode for data
If no CACH payload is available to transmit, Null message Short LCs shall be send as defined in TS 102 361-2 [5]. For
the transmission of Null message Short LC in CACH, see clause 7.1.4.
When the MS transmits in continuous transmission mode it shall set the CACH AT information element to busy and the
CACH TC information element to alternate between 0
2
and 1
2
.
NOTE: Continuous transmission mode is applicable only to Tier I products.
ETSI
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5.1.5 Reverse Channel (RC) timing
In order to support certain facilities, both the BS and MS units may send RC signalling back to a source while it is
transmitting. The following RCs signalling are defined:
• Embedded RC signalling;
• Dedicated RC signalling; and
• Standalone RC signalling.
Embedded and Dedicated RC signalling is used for the outbound channel, the Standalone RC signalling is used for the
inbound channel and direct mode.
Embedded RC signalling has the benefit of using only small amounts of bandwidth but is slow since the fields set aside
for RC are widely spaced. Dedicated RC signalling has the benefit of fast response since an entire channel is set aside
for this purpose but supports only a single call on an RF channel.
5.1.5.1 Embedded outbound Reverse Channel (RC)
Embedded RC signalling utilizes the 48-bit field defined for the centre of the burst in order to provide RC information.
This type of channel may be available both in 1:1-mode and 2:1-mode of operation.
On the outbound path, embedded RC information is carried on the alternate channel of the intended target MS. For
example, calls using outbound channel 2 for traffic will use outbound channel 1 for RC information. An RC packet is
sent every 360 ms regardless of the traffic type. This strict period allows the target MSs to always know where to expect
RC signalling without decoding other information, such as syncs or headers, on the alternate channel. Once the target
receiver synchronizes to the RC, there will be little ambiguity on whether or not to process the embedded field as RC.
Figure 5.20 illustrates an example of RC timing and access in the aligned channel timing mode. The bursts in outbound
channel 1, which carry the traffic for call "A", contain SYNC or embedded signalling data as dictated by the content of
call A except for every 6
th
burst which carries the RC information for call "B". The MSs receiving call "B" listen to
outbound channel 2 for their traffic and channel 1 for RC information. This arrangement allows the transmitter for call
B to receive RC information without interrupting its transmission as shown in the diagram.
NOTE 1: This method of RC signalling requires the use of aligned traffic channels.
NOTE 2: The RC period remains fixed once it is established, therefore the BS may need to delay data and voice
outbound transmissions by one burst to prevent their required SYNC bursts coinciding with the RC
position.
MS TX
BS TX
Time
Traffic
B
Traffic
B
211111112222222
Traffic
A
Reverse
Channel B
Reverse
Channel B
360 ms
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
B
Traffic
B
Traffic
B
TX TX TX TX
RX RX
111111122222221111111122222221
Traffic
A
Traffic
A
MS TX
BS TX
MS TX
BS TX
TimeTime
Traffic
B
Traffic
B
Traffic
B
Traffic
B
211111112222222
Traffic
A
Reverse
Channel B
Reverse
Channel B
360 ms
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
Traffic
B
TX TX TX TXTX TX TX TX
RX RXRX RX
111111122222221111111122222221
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Figure 5.20: Embedded outbound Reverse Channel (RC) timing
Since a known timing relationship between the two channels can help a receiver determine the RC period faster and
more reliably, the RC is offset approximately ½ a superframe between the two channels. When the BS is activated the
RC will be in the 3
rd
burst of slot 2 and the 6
th
burst of slot 1. Since this ties the location of the RC burst to other
signalling (i.e. synchronization), the MS can be reasonably sure that it is correctly decoding the RC.
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5.1.5.2 Dedicated outbound Reverse Channel (RC)
For Dedicated RC signalling, one outbound channel shall be used for voice/data traffic while the other outbound
channel may be used for RC signalling. This type of channel may be available only in a
1:1-mode of operation.
The RC information is carried in the 48-bit embedded field of a general data burst as it was for the embedded RC.
However, every burst on the secondary channel carries either RC information or a SYNC pattern embedded within an
Idle message. The mix of RC bursts and SYNC bursts can be changed dynamically by the BS based on perceived
instantaneous needs. The mix can vary from all SYNC pattern to all RC signalling and anywhere in between.
Figure 5.21 illustrates an example of RC timing and access.
MS TX
BS TX
Time
Traffic
A
Traffic
A
211111112222222
60 ms
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Reverse
Channel
Reverse
Channel
Reverse
Channel
Reverse
Channel
Reverse
Channel
TX TX TX TX TX TX TX TXRX RX RX RX RX RX RX
111111122222221111111122222221
Idle Idle Idle Idle Idle Idle Idle
MS TX
BS TX
MS TX
BS TX
TimeTime
Traffic
A
Traffic
A
Traffic
A
Traffic
A
211111112222222211111112222222
60 ms
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Reverse
Channel
Reverse
Channel
Reverse
Channel
Reverse
Channel
Reverse
Channel
Reverse
Channel
Reverse
Channel
Reverse
Channel
Reverse
Channel
Reverse
Channel
TX TX TX TX TX TX TX TXTX TX TX TX TX TX TX TXRX RX RX RX RX RX RXRX RX RX RX RX RX RX
111111122222221111111122222221111111122222221111111122222221
Idle Idle Idle Idle Idle Idle IdleIdleIdle IdleIdle IdleIdle IdleIdle IdleIdle IdleIdle IdleIdle
Figure 5.21: Dedicated outbound Reverse Channel (RC) timing
The bursts in outbound channel 1 carry the traffic for call "A". The bursts in outbound channel 2 contain either SYNC
or RC signalling within an Idle burst. When required, this arrangement can deliver RC information every 60 ms. The
diagram shows how the transmitter for call "A" can transition after every inbound burst to the outbound channel,
recover the RC, and transition back to the inbound transmission.
5.1.5.3 Standalone inbound Reverse Channel (RC)
Inbound standalone RC bursts may be used by MSs that want to generate RC signalling. One inbound channel shall be
used for voice or data traffic while the other inbound channel shall be used for RC signalling. This type of channel may
be available only in a 1:1-mode of operation. The shortened nature of the standalone burst allows the MS to transition
from receiving an outbound burst to transmitting an inbound standalone RC burst and back to receiving an outbound
burst.
Figure 5.22 illustrates an example of RC timing and access.
12111111222222
MS TX
BS TX
Time
TXRX RX
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
1111112222222111111122222221
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Idle Idle Idle Idle Idle Idle Idle
12111111222222
MS TX
BS TX
TimeTime
TXRX RXRX RX
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
1111112222222111111122222221
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Traffic
A
Idle Idle Idle Idle Idle Idle IdleIdleIdle IdleIdle IdleIdle IdleIdle IdleIdle IdleIdle IdleIdle
Figure 5.22: Standalone inbound Reverse Channel (RC) timing
The bursts in inbound channel 2 carry the traffic for call "A". The bursts in inbound channel 1 are unused except for the
instance of a standalone RC burst that is shown.
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5.1.5.4 Direct mode Reverse Channel (RC)
RC signalling may be used in direct mode to allow the receiver to signal the transmitter during a voice/data call without
either party missing information.
NOTE: RC signalling applies only to Tier II and Tier III products.
In direct mode, one burst of the TDMA channel shall be used as the forward path for traffic while the other burst (on the
same RF frequency) shall be used as the reverse path for RC signalling.
Figure 5.23 illustrates RC signalling that is sent directly to a transmitting MS.
Time
MS1 TX
MS2 TX
Forward Forward Forward Forward Forward Forward
Backward Backward Backward Backward Backward
Voice Voice Voice Voice Voice Voice Voice
Backward
TXRX RX
RXTX
TX
TimeTime
MS1 TX
MS2 TX
Forward Forward Forward Forward Forward Forward
Backward Backward Backward Backward Backward
VoiceVoice VoiceVoice VoiceVoice VoiceVoice VoiceVoice VoiceVoice VoiceVoice
BackwardBackward
TXRX RX
RXTX
TX
Figure 5.23: Direct mode Reverse Channel (RC) timing
A standalone RC burst shall be used that contains both SYNC and signalling. The arrows in the diagram indicate where
the transmitting MS must transition to receive the RC signal and transition back to the transmit mode. The receiving MS
shall follow the same transitions from receiving the traffic to transmitting the RC burst and back to receive.
5.2 Channel access
This clause describes the Tier II and Tier III products channel access rules and procedures that MS units shall use to
conform to when transmitting both on two frequency BS and single frequency (bi-directional) channels. These channel
access accommodate different levels of MS "politeness" (e.g. Listen Before Transmit (LBT)) and take account of
co-existence with analogue activity and other digital protocols on the same RF carrier.
Tier I products channel access may use LBT channel access rules.
This clause also describes how BSs are able to restrict channel access while activity is present (or expected) on their
inbound channels and during call hang time periods. However, it should be noted that there is a wide degree of
flexibility for the way in which BSs may regulate channel access, thereby allowing different BS implementations to
restrict channel access according to their particular system requirements.
Figure 5.24 illustrates the following three use cases for a two frequency BS channel consisting of an outbound channel
and an inbound channel:
Use Case 1: Either for two independent "repeated" simplex calls, two independent "MS to fixed end" duplex calls
or a single "repeated" duplex call.
Use Case 2: Either for a single "repeated" simplex call or a single "MS to fixed end" duplex call.
Use Case 3: For a single "repeated" simplex call with RC.
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22222211111121
22222211111112
CACH
CACH indicates inbound channel number
CACH indicates outbound channel number
Time
BS TX
Outbound channel
22222211111121
22222211111121
MS TX
Inbound channel
Use Case 1
2 traffic channels
Use Case 2
1 traffic channels
Use Case 3
1 traffic +
1 Reverse Channel
2222221111112122222211111121
22222211111112
CACH
CACH indicates inbound channel number
CACH indicates outbound channel number
TimeTime
BS TX
Outbound channel
2222221111112122222211111121
2222221111112122222211111121
MS TX
Inbound channel
Use Case 1
2 traffic channels
Use Case 2
1 traffic channels
Use Case 3
1 traffic +
1 Reverse Channel
MS TX
Inbound channel
Use Case 1
2 traffic channels
Use Case 2
1 traffic channels
Use Case 3
1 traffic +
1 Reverse Channel
Figure 5.24: Two frequency BS channel
Figure 5.25 illustrates the following three use cases for a single frequency bi-directional channel:
Use Case 1: Either for a "direct" duplex call or a single frequency "repeated" simplex call.
Use Case 2: For a "direct" simplex call.
Use Case 3: For a "direct" simplex call with RC.
Forward Forward Forward Forward Forward Forward Forward
Backward Backward Backward Backward Backward Backward Backward
Forward Forward Forward Forward Forward Forward Forward
Reverse Reverse Reverse Reverse Reverse Reverse Reverse
Forward Forward Forward Forward Forward Forward Forward
Backward Backward Backward Backward Backward Backward Backward
Time
Use Case 1
2 traffic channels
Use Case 2
1 traffic channels
Use Case 3
1 traffic +
1 Reverse Channel
Forward Forward Forward Forward Forward Forward Forward
Backward Backward Backward Backward Backward Backward Backward
Forward Forward Forward Forward Forward Forward Forward
Backward Backward Backward Backward Backward Backward Backward
Forward Forward Forward Forward Forward Forward Forward
Reverse Reverse Reverse Reverse Reverse Reverse Reverse
Forward Forward Forward Forward Forward Forward Forward
Reverse Reverse Reverse Reverse Reverse Reverse Reverse
Forward Forward Forward Forward Forward Forward Forward
Backward Backward Backward Backward Backward Backward Backward
Forward Forward Forward Forward Forward Forward Forward
Backward Backward Backward Backward Backward Backward Backward
TimeTime
Use Case 1
2 traffic channels
Use Case 2
1 traffic channels
Use Case 3
1 traffic +
1 Reverse Channel
Figure 5.25: Single frequency (bi-directional) channel
5.2.1 Basic channel access rules
5.2.1.1 Types of channel activity
When accessing a channel to transmit, a DMR entity (MS or BS) shall take account of the following types of activity
which may already be present on the channel:
• DMR activity;
• other digital protocol activity (see notes 1 and 2);
• analogue activity (see note 1).
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NOTE 1: DMR entities are able to coexist with non-DMR entities.
NOTE 2: DMR entities employing the 2-slot TDMA protocol are not expected to coexist on the same channels as
DMR entities employing the continuous transmission mode protocol.
When determining whether activity is present on a channel, a DMR entity shall monitor the RSSI level. If after a
maximum period of time T_ChMonTo the RSSI level has not exceeded a configurable (within a predefined range)
threshold N_RssiLo, then the DMR entity shall assume that activity is not present on the channel (see note 3). If
however the RSSI level does exceed threshold, then the DMR entity shall assume that activity is present on the channel
and it shall attempt to become frame synchronized to the activity for specific channel access policies, as defined in later
clauses of the present document. If the DMR entity is successful in becoming frame synchronized to the activity, then
the DMR entity shall assume that DMR activity is present on the channel. If however after a maximum period of time
T_ChSyncTo the DMR entity has not become frame synchronized to the activity, then the MS shall assume that the
activity is non-DMR activity.
NOTE 3: DMR entities may employ different N_RssiLo values for different channel access policies.
5.2.1.2 Channel status
For single frequency channels, while no activity is present the channel shall be considered "Idle" (CS_Idle) and while
activity is present (either DMR or otherwise) the channel shall be considered "Busy" (CS_Busy).
For two frequency BS channels, while no activity is present on the outbound channel, MSs shall consider the inbound
channel to be "Idle" and while non-DMR activity is present on the outbound channel, MS shall consider the inbound
channel to be "Busy".
5.2.1.3 Timing master
For two frequency BS channels if a BS is active and transmitting its outbound channel, the timing master shall be the
BS and MSs shall derive slot timing by monitoring the outbound channel and becoming frame synchronized to the
outbound channel activity. The one exception to this rule shall be where a MS fails to detect outbound channel activity
in which case it shall assume the BS to be inactive.
Where this is the case and the MS wants to use "Repeater Mode BS established timing", the MS shall be permitted to
transmit asynchronous "BS activation" signalling to the BS in accordance with the "BS activation" feature (described in
TS 102 361-2 [5]). On becoming activated, the BS shall commence transmitting activity on the outbound channel and
the MS shall derive slot timing from this activity.
Where BS is able to initiate transmitting on the outbound channel without decoding "BS activation" signalling, but by
means of decoding any correct uplink activity, the MS shall be permitted to use "Repeater Mode MS established
timing". In this case the BS acts in such way that the MS inbound channel is frame synchronized to the outbound one.
For direct channels there is no timing master and MSs shall be permitted to transmit asynchronously. The one exception
to this rule shall be where a MS wishes to transmit in a reverse slot in which case it shall derive slot timing by
monitoring the forward slots and becoming frame synchronized to the channel activity in the forward slots.
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5.2.1.4 Hang time messages and timers
A voice call shall consist of a series of speech items separated by gaps known as "call hang time periods". Also, for two
frequency BS channels, as soon as this call hang time period expires the BS may optionally remain active for a period
of time known as the "channel hang time period".
For two frequency BS channels, the call hang time period T_CallHt (which may be zero) shall be determined by the BS
configuration and during this period of time the BS shall maintain the channel in the "Busy" state by transmitting
Terminator with LC (hang time) messages on the outbound channel (with the source and destination IDs set to reflect
the voice call in progress) and setting the AT bit to "Busy". MSs employing a "polite" level of politeness
(see clause 5.2.1.6) shall not be permitted to transmit on the "Busy" channel unless they are either participating in the
specified voice call or they are employing the "polite to own Colour Code" level of politeness (see clause 5.2.1.6) and
their Colour Code is different to that contained in the hang time messages (see note). As soon as the call hang time
period T_CallHt expires, the channel hang time period T_ChHt may optionally commence and during this period of
time the BS shall maintain the channel in CS_Idle state by setting the status bit to "Idle".
NOTE: If the Colour Code is different, then the hang time messages will be considered co-channel interference
from another site.
5.2.1.5 Slot 1 and 2 dependency
If a system is configured for 2:1-mode of operation, then both inbound slots shall be available for traffic and the "Busy"
status for each inbound slot shall be independently controlled. For example, a voice or data call may be in progress on
one slot while the other slot is "Idle".
If a system is configured for 1:1-mode of operation and the dual slot data capability is used, then both inbound slot 1
and 2 shall be used for traffic. The BS shall be able to set the status of each inbound slot to "Busy" or "Idle" according
to the incoming slots.
In all other cases of a system is configured for 1:1-mode of operation, then inbound slot 2 shall be used for traffic and
inbound slot 1 may provide the optional inbound RC signalling opportunities. The BS shall be able to set the status of
each inbound RC signalling opportunity to CS_Busy or CS_Idle. When set to CS_Busy, an inbound RC opportunity
shall only be available to those MSs participating in the call in progress and when set to CS_Idle, an inbound RC
opportunity shall be available to all MSs.
5.2.1.6 Transmit admit criteria
Where a MS has been solicited to transmit a response, it may transmit the response in the expected time slot irrespective
of whether the channel is CS_Idle or CS_Busy. Additionally, while a MS is partied to a voice call, it may transmit
irrespective of whether the channel is CS_Idle or CS_Busy with DMR activity pertaining to the same voice call.
However, for all other situations, subscribers shall be configurable to employ the following levels of "politeness" on a
channel:
• Polite to all: The MS shall refrain from transmitting on a channel while the channel state is CS_Busy with
other activity (either DMR or otherwise).
• Polite to own Colour Code: The MS shall refrain from transmitting on the logical channel while the channel
state is CS_Busy with other DMR activity containing the MS's own (see note) Colour Code. For all other types
of activity (including DMR activity containing a different Colour Code) already present on the channel, the
MS shall transmit regardless.
• Impolite: The MS shall transmit on a channel regardless of any other activity (either DMR or otherwise)
already present on the channel.
NOTE: This refers to the Colour Code (CC) that the MS intends embedding in its own transmission.
On a given channel, not all features may be supported the same level of politeness. So for example, voice transmissions
may be configured to be "impolite" while packet data transmissions are configured to be "polite". Details of which
levels of politeness are employed by which facilities are contained in TS 102 361-2 [5].
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5.2.1.7 Transmission re-tries
Certain transmissions solicit responses and where these responses are not received (e.g. due to collisions, interference,
etc.) the transmitting entity may repeat the original transmission a number of times either until the response is received
or the transmitting entity gives up.
For two frequency BS channels, a MS transmitting a message that requires a response from the BS shall wait for a
configurable number of slots for the response (this configuration parameter shall allow for different system delays).
However, a BS transmitting a message that requires a response from a MS shall expect to receive the response within a
configurable number of slots (see note 1).
NOTE 1: The waiting times for re-transmission and the maximum number of re-tries are defined facility-by-facility
basis in TS 102 361-2 [5].
For single frequency (bi-directional) channels (see note 2), a DMR entity (MS or BS) transmitting a message that
requires a response from another DMR entity expect to receive the response in the next but one slot.
NOTE 2: This refers to direct channels.
In all cases, if a response is not received within the expected number of slots, then the DMR entity shall repeat the
message a number of times (each time waiting for a response) either until a response is received, the message has been
repeated a maximum number of times or unexpected DMR activity is detected (i.e. DMR activity not related to the
original message). If a response is eventually received, the procedure shall have concluded successfully, otherwise if no
response is received or unexpected DMR activity is detected, then the procedure shall have failed (see note 3).
NOTE 3: Where unexpected DMR activity is detected, certain facilities (e.g. data) may require a random back-off
and re-try procedure.
5.2.2 Channel access procedure
The basic channel access rules are given in clause 5.2.1. This clause of the present document expands upon these rules
and uses informative SDL diagrams where necessary to illustrate and highlight specific points in both direct mode and
repeater mode. Both direct and repeater modes support impolite, polite to own colour code and polite to all channel
access mechanisms. Repeater mode also supports a BS outbound activation mechanism that is initiated by the MS.
The different MS high level states as defined in annex G are used as the starting MS states when a transmission is
requested. Channel access can also be requested from the Out_of_Sync_Channel_Monitored state
(PS_OutOfSyncChMon), which is a substate of the Out_of_Sync state (PS_OutOfSync). For non-time critical
applications the MS may also transition to the Holdoff state (PS_Holdoff) while waiting for the channel to become
CS_Idle. These states are defined below:
• Out_of_Sync_Channel_Monitored (PS_OutOfSyncChMon): An MS transitions to this state from
PS_OutOfSync after it has been monitoring the RF level and has not found SYNC for a duration of time long
enough to establish knowledge of the channel. This time limit is established by the Monitor timer T_Monitor.
After the expiration of this timer the MS has determined the channel is idle with respect to DMR activity. In
this state the MS continues to monitor the RF level and search for SYNC.
• Holdoff (PS_Holdoff): An MS transitions to this state when a non-time critical transmission is requested and
the channel is busy. Here the transmission request is queued by the MS. If a random holdoff is required the MS
starts a random holdoff timer T_Holdoff. The services that allow a transmission to enter this state are defined
in TS 102 361-2 [5].
NOTE: T_Holdoff is started for non-time critical transmissions.
5.2.2.1 Direct mode Channel Access
In direct mode it is possible to initiate channel access from any of the high level MS states as defined in annex G. These
high level states include PS_OutOfSync, PS_InSyncUnknownSystem, PS_NotInCall and PS_OthersCall or PS_MyCall.
It is also possible to request channel access while in PS_OutOfSyncChMon.
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5.2.2.1.1 MS Out_of_Sync Channel Access
The three access mechanisms from the High Level MS Out_of_Sync state are illustrated in figure 5.26. This is an
informative SDL diagram that generically shows transmission request from the Out_of_Sync state. In the Out_of_Sync
state the MS has not resided on the channel long enough to immediately know the status of the channel. Therefore it
must attempt to qualify the channel status. Additionally for completeness, figure 5.26 shows how transitions from
Out_of_Sync state to either Out_of_Sync_Channel_Monitored or In_Sync_Unknown_System states occur. States not
defined in the MS High Level SDL sections are Out_of_Sync_Find_Sync and In_Sync_Unknown_System_Find_CC.
These are defined below:
• Out_of_Sync_Find_Sync: After a MS has determined RF is present on the channel it transitions to this state
and attempts to synchronize to the signal. Expiration of the Monitor Timer T_Monitor while in this state
implies the channel activity is non-DMR. For simplicity, this is illustrated as Find_Sync in figure 5.26.
• In_Sync_Unknown_System_Find_CC: After a MS has synchronized to the channel it transitions to this state
and attempts to decode the Colour Code present on the channel. Expiration of the TX_CC_Timer (T_TxCC)
while in this state implies the channel activity is for a different system. For simplicity, this is illustrated as
Find_CC in figure 5.26.
A transmission request employing impolite channel access from the High Level MS Out_of_Sync state is always
granted.
A transmission request employing either type of polite channel access policy from the High Level Out_of_Sync state
will first measure the RF level present on the channel. If the measured RF level is less than the programmed RF
threshold, then the transmission is granted for either polite access policy (see note). If the measured RF level is greater
than or equal to the programmed N_RssiLo and the requested polite channel access type is polite to all, the MS yields to
the current channel activity and denies the transmission or places it in queue.
NOTE: DMR entities may employ different N_RssiLo values for different channel access policies.
If the measured RF level is greater than or equal to the programmed N_RssiLo, the requested polite channel access type
is polite to own Colour Code and the Monitor Timer T_Monitor has not expired the MS attempts to synchronize to the
current channel activity. If the Monitor Timer T_Monitor expires the MS assumes the channel activity was a non-DMR
transmission and the transmission is granted. If the MS is able to synchronize to the channel activity, then it starts the
TX_CC_Timer (T_TxCC) and attempts to determine the Colour Code on the channel.
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If the TX_CC_Timer (T_TxCC) expires or the Colour Code does not match, then the MS grants the transmission. If the
Colour Code matches, then the transmission is denied or placed in queue and the MS moves to the High Level
Not_in_Call state.
process Out_of_Sync_Channel_Access_P2PM 1(1)
Set (T_
Monitor)
Out_of_Sync
Monitor RF Level
and Search for Sync
Find_Sync
Detect_
Sync
TX_Request,
TX_CSBK
T_Monitor T_Monitor
Detect_
Sync
In_Sync_
Unknown_
System
Out_of_Sync_
Channel_
Monitored
Set (T_TxCC)
Access_
Policy
Find_CC
TX_Granted
T_TxCC
Not_My_
System
My_System
Transmit
TX_Granted Holdoff
RF_
Level
Transmit
Set (T_
Holdoff)
TX_Denied
TX_Granted
Polite_Type
Holdoff Not_in_Call
Transmit Holdoff
Set (T_
Holdoff)
TX_Denied Find_Sync
Continue Search
for Sync
Holdoff Out_of_Sync
Impolite
Polite
yes
no<N_RssiLo >=N_RssiLo
Polite_to_All
Polite_to_CC
yes
no
Figure 5.26: Out_of_Sync SDL diagram
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5.2.2.1.2 MS Out_of_Sync_Channel_Monitored Channel Access
The three access mechanisms from the Out_of_Sync_Channel_Monitored state are illustrated in figure 5.27. This
informative SDL diagram describes a transmission request when the MS knows the channel is currently idle with
respect to DMR activity and also knows the RF level on the channel.
All transmissions from this state are granted except when the polite channel access type is polite to all and the RF level
exceeds N_RssiLo. In this case the transmission is denied or placed in queue.
process Out_of_Sync_Monitoring_Channel_Access_P2PM 1(1)
Out_of_Sync_
Channel_
Monitorted
Continue Monitoring RF
Level and Search for Sync
Detect_
Sync
TX_Request,
TX_CSBK
In_Sync_
Unknown_
System
Access_
Policy
RF_
Level
Polite_
Type
Holdoff TX_Granted
Set (T_
Holdoff)
TX_Denied Transmit
Holdoff Out_of_Sync
Polite
Impolite
>=N_RssiLo
<N_RssiLo
Polite_to_All Polite_to_CC
yes
no
Figure 5.27: Out_of_Sync_Channel_Monitored SDL diagram
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5.2.2.1.3 MS In_Sync_Unknown_System Channel Access
The three access mechanisms from the High Level MS In_Sync_Unknown_System state are illustrated in figure 5.28.
A transmission request employing impolite channel access policy from the High Level MS In_Sync_Unknown_System
state is always granted.
A transmission request employing a polite channel access type of polite to all from the High Level
In_Sync_Unknown_System state will deny the transmission or place in queue. Here the MS yields to the current
channel activity.
A transmission request employing a polite channel access type of polite to own Colour Code from the High Level MS
In_Sync_Unknown_System will start the TX_CC_Timer (T_TxCC). Here the MS attempts to determine the
Colour Code on the channel. From this point the channel access is the same as from this point when channel access is
requested from the High Level Out_of_Sync state.
process In_Sync_Unknown_System_Channel_Access_P2PM 1(1)
In_Sync_
Unknown_System
TX_Request
Access_
Policy
TX_Granted Polite_Type
Holdoff
Transmit
Set (T_TxCC)
Set (T_
Holdoff)
TX_Denied
Find_CC
Search for
Colour Code
Holdoff Out_of_Sync
T_TxCC
Not_My_
System
My_System
TX_Granted Holdoff
Transmit
Set (T_
Holdoff)
TX_Denied
Holdoff Not_in_Call
Impolite Polite
Polite_to_All
Polite_to_CC
yes
no
yes
no
Figure 5.28: In_Sync_Unknown_System SDL diagram
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5.2.2.1.4 MS Not_in_Call Channel Access
A transmission request employing impolite channel access policy from the High Level MS Not_in_Call state is always
granted.
A transmission request employing either polite channel access policy type from the High Level Not_in_Call state will
be denied or placed in queue if it is non-time critical. This occurs since in order to reach this state the MS has matched
the Colour Code. The MS will stay in the Not_in_Call state.
5.2.2.1.5 MS Others_Call Channel Access
A transmission request employing impolite channel access policy from the High Level MS Others_Call state is always
granted.
A transmission request employing either polite channel access policy type from the High Level Others_Call state will
be denied or placed in queue if it is non-time critical. This occurs since in order to reach this state the MS has matched
the Colour Code. The MS will stay in the Others_Call state.
5.2.2.1.6 MS My_Call Channel Access
In this state the MS is party to the call and will use the impolite channel access method. This is regardless of the
programmed channel access policy programmed into the MS.
5.2.2.2 Repeater mode channel access
In repeater mode it is possible to initiate channel access from any of the high level MS states as defined in annex G.
These high level states include Out_of_Sync, In_Sync_Unknown_System, Not_in_Call and Others_Call, In_Session or
My_Call. It is also possible to request channel access while in the Out_of_Sync_Channel_Monitored state. When a
transmission request occurs from the Out_of_Sync, or In_Sync_Unknown_System states, the MS must first verify that
the outbound is present. If it is not present, the MS attempts to activate the BS outbound.
5.2.2.2.1 MS Out_of_Sync Channel Access
In repeater mode channel activity is not sufficient to grant a MS transmission from the High Level Out_of_Sync state.
The MS must first sync to the outbound, match the Colour Code and determine the slotting structure. The three access
mechanisms from the Out_of_Sync state are illustrated in figure 5.29. This is an informative SDL diagram that
generically shows transmission requests from the Out_of_Sync state. In the Out_of_Sync state the MS has not resided
on the channel long enough to immediately know the status of the channel. Therefore it must attempt to qualify the
channel status. Additionally for completeness, figure 5.28 shows how transitions from Out_of_Sync state to either
Out_of_Sync_Channel_Monitored or In_Sync_Unknown_System states occur. States not defined in the MS High Level
SDL sections or the direct mode channel access section are TX_Wakeup_Message and
In_Sync_Unknown_System_Find_CC_Slot. These are defined below:
• TX_Wakeup_Message: After a MS has determined that the correct BS outbound is not present, it transitions
to this state and transmits a burst to activate the BS outbound.
• In_Sync_Unknown_System_Find_CC_Slot: After a MS has synchronized to the channel it transitions to this
state and attempts to decode the Colour Code present on the channel and the slotting structure of the channel.
Expiration of the TX_CC_Slot_Timer (T_TxCCSlot) while in this state implies the channel activity is for a
different system.
No matter which channel access mechanism is desired from this state, the MS sets the Wakeup_Message counter to
zero. If the measured RF level is less than the programmed RF threshold N_RssiLo, the MS transitions to the
TX_Wakeup_Message state. Details on the TX_Wakeup_Message state are given in figure 5.32. If the measured RF
level is greater than or equal to the programmed RF threshold N_RssiLo then the MS transitions to Find_Sync and
attempts to acquire synchronization.
If the Monitor Timer T_Monitor expires, it is assumed the channel activity was non-DMR. If the channel access policy
is impolite or the polite policy type is polite to own Colour Code the MS transitions to the TX_Wakeup_Message state.
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If SYNC is detected, the MS starts the TX_CC_Slot_Timer (T_TxCCSlot) and attempts to determine the Colour Code
and slotting structure of the received signal. If the timer expires, then the MS transitions to the TX_Wakeup_Message
state. If the Colour Code does not match, the MS denies or queues the transmission if the polite channel access type is
polite to all or transitions to the TX Wakeup_Message state if the channel access policy is impolite or the polite policy
type is polite to own Colour Code. If the MS matches its Colour Code and determines the slotting structure, the MS
moves to the High Level In_Sync_My_System state. Transmissions from this state are defined in clause 5.2.2.2.5.
If the MS arrives at the Find_Sync state from the TX_Wakeup_Message state, a Sync_WU_Timer (T_SyncWu) has
been started. If this timer expires, the MS transitions back to the TX_Wakeup_Message state.
process Out_of_Sync_BS_Activation 1(1)
Set (T_
Monitor)
Out_of_Sync
Monitor RF Level
and Search for Sync
Find_Sync
Detect_
Sync
TX_
Request
T_Monitor T_Monitor Sync_WU
Detect_
Sync
In_Sync_
Unknown_
System
Out_of_Sync_
Channel_
Monitored
TX_Wakeup_
Message
Set (T_
TxCCSlot)
N:=0
Wakeup
Message
Counter
Find_CC_
Slot
T_
TxCCSlot
Not_My_
System
My_
System
RF_Level
Find_Sync
TX_Wakeup_
Message
Access_
Policy
In_Sync_
My_System
Polite_
Type
TX_Wakeup_
Message
Holdoff
Set (T_
Holdoff)
TX_Denied
Holdoff Out_of_Sync
>=N_RssiLo <N_RssiLo
Polite
Impolite
Polite_to_CC
Polite_to_All
yes
no
Figure 5.29: Out_of_Sync SDL diagram
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5.2.2.2.2 MS Out_of_Sync_Channel_Monitored Channel Access
The three access mechanisms from the Out_of_Sync_Channel_Monitored state are illustrated in figure 5.30. This
informative SDL diagram describes a transmission request when the MS knows the channel is currently idle with
respect to DMR activity and also knows the RF level on the channel.
Upon receiving the TX_Request primitive, the Wakeup Message Counter is initialized to zero. A transition to the
TX_Wakeup_Message state always occurs except when the polite channel access type is polite to all and the RF Level
exceeds the RF threshold N_RssiLo. In this case the transmission is either denied or placed in queue.
process Out_of_Sync_Channel_Monitored_BS_Activation 1(1)
Out_of_Sync_
Channel_
Monitored
Continue Monitoring RF
Level and Search for Sync
Detect_
Sync
TX_
Request
In_Sync_
Unknown_
System
N:=0
Wakeup
Message
Counter
Access_
Policy
RF_
Level
Polite_
Type
Holdoff
TX_Wakeup_
Message
Set (T_
Holdoff)
TX_Denied
Holdoff Out_of_Sync
Polite
Impolite
>=N_Rssi_Lo
<N_Rssi_Lo
Polite_to_All Polite_to_CC
yes
no
Figure 5.30: Out_of_Sync_Channel_Monitored channel access
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5.2.2.2.3 MS In_Sync_Unknown_System channel access
When channel access is requested from the High Level In_Sync_Unknown_System state the MS sets the
Wakeup_Message counter to zero and starts the TX_CC_Slot_Timer (T_TxCCSlot) while it attempts to determine the
Colour Code and slotting structure of the received signal. If the MS matches its Colour Code and determines the slotting
structure, the MS moves to the High Level Not_in_Call state. Transmissions from this state are defined in
clause 5.2.2.2.5.
If the T_TxCCSlot expires or the Colour Code does not match and the channel access policy is impolite or the polite
type is polite to Colour Code then the MS transitions to the TX_Wakeup_Message state. If the polite channel access
type is polite to all then the transmission is either denied or placed in queue.
process In_Sync_Unknown_System_BS_Activation 1(1)
In_Sync_
Unknown_System
TX_
Request
N:=0
Wakeup
Message
Counter
Set (T_
TxCCSlot)
Find_CC_
Slot
Not_My_
System
My_
System
T_
TxCCSlot
Access_
Policy
Not_In_Call
TX_Wakeup_
Mesage
Polite_
Type
Holdoff
TX_Wakeup_
Message
Set (T_
Holdoff)
TX_Denied
Holdoff Out_of_Sync
Polite Impolite
Polite_to_All Polite_to_CC
yes
no
Figure 5.31: In_Sync_Unknown_System SDL diagram
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5.2.2.2.4 MS TX_Wakeup_Message
A MS transitions to this state after a transmission is requested but the correct outbound has not been identified. The MS
compares the programmable WU_Threshold N_Wakeup with the Wakeup Message counter. If the counter is equal to
N_Wakeup, the number of wakeup attempts has been exhausted and the transmission is denied or queued. If the counter
is less than N_Wakeup, the MS transmits a wakeup message, increments the Wakeup_Message counter by one and
starts the Sync_WU_Timer (T_SyncWu). Then it transitions to the Find_Sync state.
process TX_Wakeup_Message 1(1)
TX_Wakeup_
Message
N
Wakeup
Message
Counter
N
Holdoff
Tune_to_
Uplink
Set (T_
Holdoff)
TX_Denied
TX_Wakeup_
Message
Transmit BS
Downlink Activation
Message
Holdoff Out_of_Sync N:=N+1
Set (T_
SyncWu)
Tune_to_
Downlink
Find_Sync
=N_Wakeup <N_Wakeup
yes
no
Figure 5.32: TX_Wakeup_Message SDL diagram
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5.2.2.2.5 MS Not_In_Call channel access
The MS may be in this state when the TX_request is initiated or may transition to this state after successfully activating
the BS outbound. Either way, an impolite channel access policy transmission is granted and a polite channel access type
transmission must first determine if the desired slot is idle. If the channel access policy is polite, the MS starts an
Idle_Search_Timer (T_IdleSrch). If the Idle_Search_Timer (T_IdleSrch) expires before the channel is determined to be
idle or the channel is determined to be busy the transmission is denied or queued. If the slot is determined to be idle the
MS grants the transmission.
process Not_in_Call_Channel_Access_RM 1(1)
Not_in_Call
Color Code matches
and slotting structure
known
TX_
Request
Access_
Policy
Set (T_
IdleSrch)
Channel_
Status
Busy,
T_IdleSrch
Idle
Holdoff
TX_Granted
TX_Denied
Set (T_
Holdoff)
Transmit
Not_in_Call Holdoff
Polite Impolite
no yes
Figure 5.33: Not_in_Call SDL diagram
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5.2.2.2.6 MS Others_Call channel access
The MS will grant a transmission from the Others_Call state if the channel access policy is impolite. It will deny or
queue the transmission if the channel access policy is polite.
process Others_Call_Channel_Access_RM 1(1)
Others_Call
Color Code matches
and slotting structure
known
TX_Request
Access_
Policy
TX_Granted Holdoff
Transmit TX_Denied
Set (T_
Holdoff)
Not_in_Call Holdoff
Impolite Polite
no
yes
Figure 5.34: Others_Call SDL diagram
5.2.2.2.7 MS My_Call channel access
In this state the MS is party to the call and will use the impolite channel access method for voice calls. This is regardless
of the programmed channel access policy programmed into the MS.
5.2.2.2.8 MS In_Session channel access
In this state the MS is party to the call and will use the impolite channel access method for voice calls. This is regardless
of the programmed channel access policy programmed into the MS.
5.2.2.3 Non-time critical CSBK ACK/NACK channel access
Figure 5.35 illustrates the MS DLL when the MS receives an individually addressed CSBK that requires a non-time
critical response. The response may be either an ACK or a NACK and channel access may be either impolite or polite.
The actual channel access rules for features requiring CSBK transmission are defined in TS 102 361-2 [5]. This may
include the addition of counters or timers to limit how long an MS will attempt a CSBK transmission when the channel
is busy.
The DLL receives a TX_CSBK primitive from the CCL while in the TX_Idle state. TX_Idle is a general state when the
MS is currently not attempting to transmit. When employing polite channel access responses and attempting to transmit
the NACK_Rsp, the MS DLL starts the Idle_Search Timer T_IdleSrch and transitions to the Qualify_Idle state. In this
state if the channel is idle, the message is transmitted. However, while in this state if the timer expires or the channel is
busy a Random_Holdoff timer is started. Upon the expiration of this timer the MS transitions back to the Qualify_Idle
state. It is the responsibility of the DLL to attempt to transmit the message.
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process FNS_NACK_CSBK_TX
1(1)
TX_Idle Qualify_Idle
TX_CSBK
Busy,
T_IdleSrch
Idle
Set (T_
IdleSrch)
Set (T_
Holdoff)
TX_CSBK
Qualify_Idle Holdoff TX_Idle
T_
Holdoff
Qualify_Idle
Figure 5.35: FNS channel access SDL diagram
6 Layer 2 burst format
The following clauses define the burst formats and channels for DMR. This includes voice bursts, general data bursts,
and the Common Announcement Channel. The bursts contain user data and/or signalling encapsulated in Protocol Data
Units (PDUs), with its associated bits for error detection and/or correction. The PDUs and its information elements that
are carried by these bursts are defined in detail in clause 9. The burst definition diagrams use the legends shown in
figure 6.1. The exact bit position within a burst is defined in annex E.
name (n)
Field description
Field length in bits
Vocoder payload
EMB field
Frame SYNC
Data/Control payload
LC/RC payload
Slot Type field
CACH
name (n)
Field description
Field length in bits
name (n)name (n)
Field description
Field length in bits
Vocoder payload
EMB field
Frame SYNC
Data/Control payload
LC/RC payload
Slot Type field
CACH
Vocoder payload
EMB field
Frame SYNC
Data/Control payload
LC/RC payload
Slot Type field
CACH
Figure 6.1: Colour legends
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6.1 Vocoder socket
The vocoder bits are carried in a voice burst over the air as shown in figure 6.2. Each voice burst provides a
"vocoder socket" for 2 × 108 bits vocoder payload (VS) to carry 60 ms of compressed speech. The vocoder bits are
labelled VS(0) - VS(215) and are placed in the burst as shown in figure 6.2.
Voice (108)
SYNC or
embedded
signalling (48)
27,5 ms
Voice (108)
VS(107)VS(108) VS(0)VS(215)
Voice (108)Voice (108)
SYNC or
embedded
signalling (48)
SYNC or
embedded
signalling (48)
27,5 ms27,5 ms
Voice (108)Voice (108)
VS(107)VS(107)VS(108)VS(108) VS(0)VS(0)VS(215)VS(215)
Figure 6.2: Generic voice burst
Usually more than one vocoder frame is transmitted in the same burst. Each Voice burst is capable of transferring M
vocoder frames called VF(1), VF(2), … VF(M) where the vocoder outputs VF(1) before VF(2) and so on, giving them
in this order to the transmission path. If this is the case the order of the vocoder frames contained in the same burst must
be such that the MSB of VF(1) is transmitted as VS(215) and the LSB of VF(M) is transmitted as VS(0). All the bits of
a given voice frame should be placed contiguously in the burst.
In addition to vocoder bits, these voice bursts carry either embedded signalling (EMB field + embedded signalling) or
frame synchronization (SYNC) in the centre of the burst. This same format is used for both inbound and outbound
bursts.
Figure 6.3 illustrates a voice burst containing frame synchronization. The SYNC pattern is described in clause 9.1.1.
SYNC (48)
27,5 ms
Voice (108) Voice (108)
SYNC (48)SYNC (48)
27,5 ms27,5 ms
Voice (108)Voice (108) Voice (108)Voice (108)
Figure 6.3: Voice burst with SYNC
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Figure 6.4 illustrates a voice burst containing embedded signalling and shows the parameters of the EMB field.
27,5 ms
CC
PI
LCSS
EMB Parity
Voice (108) Voice (108)
Embedded
signalling (32)
EMB (8)
EMB (8)
27,5 ms27,5 ms
CC
PI
LCSS
EMB Parity
Voice (108)Voice (108) Voice (108)Voice (108)
Embedded
signalling (32)
EMB (8)
EMB (8)
Embedded
signalling (32)
Embedded
signalling (32)
EMB (8)EMB (8)
EMB (8)EMB (8)
Figure 6.4: Voice burst with embedded signalling
The embedded signalling is either Link Control (LC), Reverse Channel (RC) information or Null embedded message
(see clause D.1).
6.2 Data and control
A single burst format shall be used for data and control, both inbound and outbound, as shown in figure 6.5. Also shown
are the symbol numbers, counting Left (L) and Right I from the burst centre, of the information element boundaries.
Either a data SYNC or embedded signalling information shall be provided in the centre of every control burst in a
manner similar to the voice bursts. Every data and control burst contains a 20-bit Slot Type PDU (SLOT) that defines
the meaning of the 196 information bits. The purpose of the Data Type information element of the SLOT PDU shall be
as defined in table 6.1 which shows also the used payload FEC. The detailed coding is described in clause 9.3.6. The
SYNC pattern is described in clause 9.1.1.
L17
Slot Type (10)
Slot Type (10)
Info (98)
Info (98)
SYNC or
embedded
signalling (48)
L66
R66
27,5 ms
Data TypeCC
FEC Parity
FEC Parity
L18
L12 R12
L13
R13
R18
R17
L17L17
Slot Type (10)Slot Type (10)
Slot Type (10)Slot Type (10)
Info (98)Info (98)
Info (98)Info (98)
SYNC or
embedded
signalling (48)
SYNC or
embedded
signalling (48)
L66L66
R66R66
27,5 ms27,5 ms
Data TypeCC
FEC Parity
FEC Parity
L18L18
L12L12 R12R12
L13L13
R13
R18
R18
R17R17
Figure 6.5: General data burst
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Table 6.1: Data Type information element definitions
Data Type Purpose Payload FEC
PI Header, see note Privacy Indicator information in a
standalone burst
BPTC(196,96)
Voice LC Header Indicates the beginning of voice
transmission, carries addressing
information
BPTC(196,96)
Terminator with LC Indicates the end of transmission,
carries LC information
BPTC(196,96)
CSBK Carries a control block BPTC(196,96)
MBC Header, Header for multi-block control BPTC(196,96)
MBC Continuation Follow-on blocks for multi-block
control
BPTC(196,96)
Data Header Carries addressing and numbering
of packet data blocks
BPTC(196,96)
Rate ½ Data
Continuation
Payload for rate ½ packet data BPTC(196,96)
Rate ¾ Data
Continuation
Payload for rate ¾ packet data Rate ¾ Trellis
Idle Fills channel when no info to
transmit
BPTC(196,96)
NOTE: This information element is not defined in the present document
and is reserved for future use.
6.3 Common Announcement Channel burst
The CACH exists on the outbound channel only. This field provides framing and access information for the bursts as
well as low-speed data. This channel is not tied to channel 1 or 2 but is common between them, as shown in figure 6.6.
Outbound burst
30,0 ms 30,0 ms
TDMA frame
CACHCACH (24)
CACHCACH (24)
CACHCACH (24)
Interleaver
Outbound burst
AT TC LCSS FEC
CACH signaling
Outbound burstOutbound burst
30,0 ms30,0 ms 30,0 ms30,0 ms
TDMA frameTDMA frame
CACHCACH (24)CACHCACH (24)
CACHCACH (24)CACHCACH (24)
CACHCACH (24)CACHCACH (24)
InterleaverInterleaver
Outbound burstOutbound burst
AT TC LCSS FEC
CACH signaling
AT TC LCSS FECAT TC LCSS FEC
CACH signalingCACH signaling
Figure 6.6: CACH burst
Of the 24 bits present in each CACH burst, 4 information and 3 parity bits are dedicated to framing and status. These
bits, termed the TDMA Access Channel Type (TACT) bits, are protected by a Hamming (7,4) FEC code. The
remaining 17 bits of each CACH burst carry signalling. No FEC is provided by the CACH for this signalling. Instead,
any FEC and CRC is part of the payload, see clause B.2.3.
Since this is a common channel, not tied to either the channel 1 or 2, CACH bursts occur every 30 ms. This results in an
overall payload bit rate of (17 bits/burst) / (30 ms/burst) = 566,67 bits/s.
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Where DMR activity is present on the outbound channel, then the AT bit in each CACH shall indicate to MSs whether
the next slot on the inbound channel whose TDMA channel number is indicated by the TC bit (see figure 5.23 for
details of the timing relationship between the CACH and inbound/outbound slots) is "Idle" or "Busy".
Typically a BS shall set the AT to "Busy" while DMR activity is present on the inbound channel. Additionally, BSs
may also set the AT bit to "Busy" during the call hang time periods for voice calls and whenever activity
(e.g. an acknowledgement) is anticipated on the inbound channel.
NOTE: LCSS indicates that this burst contains the beginning, end, or continuation of an LC or CSBK signalling.
Due to the small number of bits available, there is no single fragment LC signalling defined.
The number of CACH fields that are combined for a PDU shall not change during a BS outbound transmission. This
will improve MS decode reliability.
6.4 Reverse Channel
6.4.1 Standalone inbound Reverse Channel burst
A standalone inbound RC burst allows a MS to send RC signalling on an inbound channel to a BS and or directly to
another MS in direct mode. This burst combines both a 48-bit RC SYNC word and a 48-bit embedded signalling field
into a single burst as shown in figure 6.7. The use of previously defined fields allows the reuse of existing FEC codes
and processing software for this burst type.
Combining the SYNC word and signalling in the same burst allows the MS to send the information in a single 30 ms
window for low latency. Limiting the size to 96 bits allows a MS to transition from receiving traffic on one TDMA
channel to transmitting RC signalling on the other TDMA channel and back within a 30 ms window.
10,0 ms
30,0 ms
Sync
Sync
Sync
Sync
Sync
Sync
CC
PI
LCSS
EMB Parity
RC Info + FEC Parity
Parity
RC Info + FEC Parity
RC Info + FEC Parity
RC Info + FEC Parity
SYNC (48)
EMB (8)
EMB (8)
RC (16)
RC (16)
10,0 ms
30,0 ms
Sync
Sync
Sync
Sync
Sync
Sync
CC
PI
LCSS
EMB Parity
RC Info + FEC Parity
Parity
RC Info + FEC Parity
RC Info + FEC Parity
RC Info + FEC Parity
SYNC (48)
EMB (8)
EMB (8)
RC (16)
RC (16)
Figure 6.7: Standalone inbound Reverse Channel (RC) burst
The SYNC pattern is placed at the centre of the burst, as it is in all other bursts, so that a receiver can detect it using its
normal SYNC detection mechanisms (see note). The signalling information is evenly distributed on either side of the
SYNC for symmetry, providing the same transition time for a MS switching from RX to TX and from TX back to RX.
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The 11 bits of RC signalling is carried in the 32-bit field, labelled RC info + FEC Parity in the diagram. The LCSS field
shall be set to indicate a single fragment LC packet. All other fields shall be set according to the current system
configuration and mode of operation.
NOTE: Processing this RC burst is optional. The BS ignores the RC burst if it does not support RC signalling.
6.4.2 Outbound reverse channel (RC) burst
An embedded outbound RC burst allows the BS to send RC signalling on an outbound channel to a MS within a traffic
channel. This burst places the RC signalling in a single embedded
48-bit EMB/LC field as shown in figure 6.8.
PayloadPayload
CC
PI
LCSS
EMB Parity
RC Info + FEC Parity
Parity
RC (32)
EMB (8)
EMB (8)
5,0 ms
27,5 ms
RC Info + FEC Parity
RC Info + FEC Parity
RC Info + FEC Parity
PayloadPayload
CC
PI
LCSS
EMB Parity
RC Info + FEC Parity
Parity
RC (32)RC (32)
EMB (8)EMB (8)
EMB (8)EMB (8)
5,0 ms
27,5 ms
RC Info + FEC Parity
RC Info + FEC Parity
RC Info + FEC Parity
Figure 6.8: Outbound Reverse Channel (RC) burst
The RC signalling is carried in an 11-bit field RC Info and is FEC encoded and interleaved as described in clause B.2.2.
The LCSS field shall be set to indicate a single fragment LC packet. All other fields shall be set according to the current
system configuration and mode of operation.
NOTE: The payload, as seen in figure 6.8, may be either vocoder bits for voice bursts or data plus slot type for
data bursts.
When a RC opportunity arrives and there is not valid signalling to transmit, the Null embedded message, defined in
clause D.1, shall be transmitted.
7 DMR signalling
7.1 Link Control message structure
For Link Control signalling a Full LC message and a Short LC message is defined.
The Full Link Control message contains a 72-bit information field and is carried by:
• voice and data (embedded);
• headers;
• terminators.
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The general structure of the Full Link Control message is shown in figure 7.1.
Bit
7 6 5 4 3 2 1 0
PF
Data
FLCO
Octet
0
1
2
3
4
5
6
7
8
R
FID
Bit
7 6 5 4 3 2 1 0
PF
Data
FLCO
Octet
0
1
2
3
4
5
6
7
8
Octet
0
1
2
3
4
5
6
7
8
R
FID
Figure 7.1: Full LC message structure
The Full LC contains 7 octets of data (see note 1) associated with the Full LC Opcode (FLCO) and the Feature ID (FID)
combination.
NOTE 1: The DATA information element contains feature specific information (e.g. Source ID and Destination ID)
and is defined in TS 102 361-2 [5].
The Short Link Control message contains a 28-bit information field and is carried by the CACH. The general structure
of the Short Link Control message is shown in figure 7.2.
0
1
2
3
Bit
7 6 5 4 3 2 1 0
Octet
SLCO
Data
0
1
2
3
Bit
7 6 5 4 3 2 1 0
Octet
SLCO
Data
Bit
7 6 5 4 3 2 1 0
Octet
SLCO
Data
Figure 7.2: Short LC message structure
The Short LC contains 3 octets of data (see note 2) associated with the Short LC Opcode (SLCO).
NOTE 2: The DATA information element contains feature specific information and is defined in
TS 102 361-2 [5].
7.1.1 Voice LC header
When sent, a header burst shall be sent at the start of a voice transmission, using the general data format, to indicate the
beginning of a voice transmission (see clause 5.1.2.2). The LC header contains a Full Link Control Header PDU, the
general structure of which is described in clause 7.1.
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Figure 7.3 illustrates how the 72-bit LC field, along with a 24-bit CRC, is carried in a single general data burst.
Before the BPTC(196,96) encoder, the appropriate Data Type CRC Mask as defined in clause B.3.12 of the present
document shall be applied to the 24 bit CRC. The Data Type field of the Slot Type field shall be set to
"Voice LC Header".
SYNC
Slot Type (10)
Slot Type (10)
Info (98)
Info (98)
Interleaver
BPTC(196, 96) Encoder
LC (72)
CRC (24)
27,5 ms
SYNCSYNC
Slot Type (10)Slot Type (10)
Slot Type (10)Slot Type (10)
Info (98)Info (98)
Info (98)Info (98)
Interleaver
BPTC(196, 96) Encoder
Interleaver
BPTC(196, 96) Encoder
InterleaverInterleaver
BPTC(196, 96) EncoderBPTC(196, 96) Encoder
LC (72)LC (72)
CRC (24)CRC (24)
27,5 ms27,5 ms
Figure 7.3: LC Voice header format
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7.1.2 Terminator with LC
Voice call speech items may be terminated by transmitting a burst containing a data SYNC immediately after the last
voice burst.
The 72 bits of LC information are protected using a 24-bit CRC and a BPTC FEC as shown in figure 7.4.
Before the BPTC(196,96) encoder, the appropriate Data Type CRC Mask as defined in clause B.3.12 of the present
document shall be applied to the 24 bit CRC. The Data Type field of the Slot Type field shall be set to
"Terminator with LC".
SYNC
Info (98)
Info (98)
Slot Type (10)
Slot Type (10)
Interleaver
BPTC(196, 96) Encoder
LC (72) CRC (24)
27,5 ms
SYNC
Info (98)
Info (98)SYNCSYNC
Info (98)Info (98)
Info (98)Info (98)
Slot Type (10)Slot Type (10)
Slot Type (10)Slot Type (10)
Interleaver
BPTC(196, 96) Encoder
Interleaver
BPTC(196, 96) Encoder
InterleaverInterleaver
BPTC(196, 96) EncoderBPTC(196, 96) Encoder
LC (72) CRC (24)LC (72)LC (72) CRC (24)CRC (24)
27,5 ms27,5 ms
Figure 7.4: Terminator with LC
7.1.3 Embedded signalling
In order to facilitate late entry, LC messages shall be carried in the embedded field of the voice bursts. A 72-bit LC
message, after FEC encoding and fragmenting, fits into the embedded field of four bursts as described in clause B.2.1.
This means that a 6-burst voice superframe can allocate one burst for SYNC, four bursts for LC, and one burst for the
RC (as shown in figure 7.5) or Null embedded message (as shown in figure 7.6).
All four bursts of one LC message shall be carried within a single voice superframe. The LC starts on the first
non-SYNC and non-RC burst of a superframe.
The beginning, continuation, and end of a complete LC message are framed using the LCSS bits of the EMB field as
described in clause 6.1. Non-LC embedded signalling types may be inserted within a multi-part LC by setting the LCSS
bits to indicate that this burst contains a "Single Fragment LC Packet".
NOTE: The interpretation of these non-LC bursts is dependent on call type and context.
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7.1.3.1 Outbound channel
In order to support RC features in the outbound channel, a single burst from each outbound voice superframe shall be
dedicated for RC signalling, as shown in figure 7.5.
Voice
Voice
Voice
VoiceVoiceVoice
Voice SYNC
ACEBF
Reverse Channel
D
Voice superframe = 360 ms
LC (72)
Checksum (5)
BPTC
FEC Interleaver
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoiceVoiceVoiceVoiceVoice
Voice SYNC
ACEBF
Reverse ChannelReverse Channel
D
Voice superframe = 360 msVoice superframe = 360 ms
LC (72)
Checksum (5)
LC (72)LC (72)
Checksum (5)Checksum (5)
BPTCBPTC
FEC InterleaverFEC Interleaver
Figure 7.5: Outbound voice superframe example
Burst A always contains a voice SYNC pattern and one of the other voice bursts, B to F, is dedicated for periodic RC
signalling as described in clause 5.1.5.1.
NOTE: Since the location of the RC burst is fixed but the start of a voice superframe is random, then the burst
used for RC signalling may vary from call to call.
The four remaining voice bursts, B to F, in the voice superframe carry embedded signalling messages. An example
outbound voice superframe is shown in figure 7.5, where the C burst is used for RC signalling.
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7.1.3.2 Inbound channel
The inbound voice superframe shall not contain a RC, therefore in order to maintain consistent timing between the
inbound and outbound LC messages, burst F of an inbound voice superframe shall always be filled with Null embedded
message, thereby ensuring that a single LC message is sent in every voice superframe. This is illustrated in figure 7.6.
Voice
Voice
Voice
VoiceVoiceVoice
Voice SYNC
ACEBF
Null
D
Voice superframe = 360 ms
LC (72)
Checksum (5)
BPTC
FEC Interleaver
VoiceVoice
VoiceVoice
VoiceVoice
VoiceVoiceVoiceVoiceVoiceVoice
Voice SYNC
ACEBF
Null
D
Voice superframe = 360 ms
LC (72)
Checksum (5)
LC (72)LC (72)
Checksum (5)Checksum (5)
BPTCBPTC
FEC InterleaverFEC Interleaver
Figure 7.6: Inbound voice superframe
7.1.4 Short Link Control in CACH
A Short LC message has been specifically defined to be carried by the CACH as shown in figure 7.7. The LC PDU has
a length of 36 bits and is protected using a block product turbo code as described in clause B.2.3.
Short LC (28) CRC (8)
BPTC
FEC Interleaver
30 ms
CACH
CACH
Outbound burst
Interleaver
TACT bits
Interleaver
30 ms
CACH
Outbound burst
CACH
Interleaver
TACT bits
Interleaver
TACT bits
Outbound burst
30 ms
TACT bits
Short LC (28) CRC (8)Short LC (28)Short LC (28) CRC (8)CRC (8)
BPTCBPTC
FEC InterleaverFEC Interleaver
30 ms30 ms
CACHCACH
CACHCACH
Outbound burstOutbound burst
InterleaverInterleaver
TACT bitsTACT bits
InterleaverInterleaver
30 ms
CACH
Outbound burst
CACH
Interleaver
TACT bits
Interleaver
TACT bits
30 ms30 ms
CACHCACH
Outbound burstOutbound burst
CACHCACH
InterleaverInterleaver
TACT bitsTACT bits
InterleaverInterleaver
TACT bitsTACT bits
Outbound burstOutbound burst
30 ms30 ms
TACT bitsTACT bits
Figure 7.7: Short LC in CACH
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The resulting FEC matrix is interleaved over multiple CACH bursts for resistance to errors. Each LC fragment is further
interleaved with the CACH TACT bits as it is placed into the CACH field. Since the entire payload can be delivered in
4 CACH bursts, one message can be sent every 4 × 30 ms = 120 ms.
7.2 Control Signalling BlocK (CSBK) message structure
The CSBK message contains a 96-bit information field.
The general structure of the CSBK message is shown in figure 7.8.
CSBK CRC
Bit
7 6 5 4 3 2 1 0
LB
PF
CSBKO
Octet
0
1
2
3
4
5
6
7
8
9
10
11
FID
Data
CSBK CRC
Bit
7 6 5 4 3 2 1 0
LB
PF
CSBKO
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Octet
0
1
2
3
4
5
6
7
8
9
10
11
FID
Data
Figure 7.8: CSBK message structure
The CSBK contains 8 octets of data (see note 1) associated with the CSBK Opcode (CSBKO) and the Feature ID (FID)
combination. The LB information element shall be set to 1
2
.
NOTE 1: The DATA information element contains feature specific information (e.g. Source ID and Destination ID)
and is defined in TS 102 361-2 [5].
NOTE 2: The message structure of a Multiple Block Control (MBC) is defined in clause 7.4.
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7.2.1 Control Signalling BlocK (CSBK)
The 96 bit CSBK (80 bits of signalling + 16 bits of CRC) shall be protected by a BPTC(196,96) FEC, as described in
clause B.
Before the BPTC(196,96) encoder, the appropriate Data Type CRC Mask as defined in clause B.3.12 of the present
document shall be applied to the 16 bit CRC. The information bits can be carried in a single data burst as shown in
figure 7.9. The Data Type field of the Slot Type field shall be set to "CSBK".
Info (98)
Info (98)SYNC
Slot Type (10)
Slot Type (10)
Interleaver
BPTC(196, 96) Encoder
CSBK (80)
27,5 ms
CRC(16)
Info (98)Info (98)
Info (98)Info (98)SYNCSYNC
Slot Type (10)Slot Type (10)
Slot Type (10)Slot Type (10)
InterleaverInterleaver
BPTC(196, 96) EncoderBPTC(196, 96) Encoder
CSBK (80)CSBK (80)
27,5 ms27,5 ms
CRC(16)CRC(16)
Figure 7.9: CSBK format
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7.3 Idle message
Idle messages are transmitted by the BS when it has no other valid signalling or traffic to send. The Data Type field of
the Slot Type field must be set to "Idle". The info fields of Idle messages will be filled with predetermined
Pseudo-Random Fill Bits (PR FILL).
SYNC or
embedded
signalling (48)
Slot Type (10)
Slot Type (10)
Interleaver
BPTC(196, 96) Encoder
Pseudo-Random FilI(96)
Info (98) Info (98)
27,5 ms
SYNC or
embedded
signalling (48)
SYNC or
embedded
signalling (48)
Slot Type (10)Slot Type (10)
Slot Type (10)Slot Type (10)
InterleaverInterleaver
BPTC(196, 96) EncoderBPTC(196, 96) Encoder
Pseudo-Random FilI(96)Pseudo-Random FilI(96)
Info (98)Info (98) Info (98)Info (98)
27,5 ms27,5 ms
Figure 7.10: Idle message format
These bits are encoded using BPTC(196,96) FEC and interleaver used for normal data and control as shown in
figure 7.10. These bits are included only to enable continuous transmission by the BS. They are not intended to be read
or processed by the MSs.
7.4 Multi Block Control (MBC) message structure
The MBC message is used when a CSBK cannot carry all of the required control information. The basic format is built
upon the CSBK message structure. The MBC message shall consist of a MBC header, between 0 and 2 MBC
intermediate blocks and a MBC last block. The general structure of the three different MBC message blocks are shown
in figures 7.11 to 7.13.
NOTE 1: MBCs are transmitted contiguously on a slot.
MBC header CRC
Bit
7 6 5 4 3 2 1 0
LB
PF CSBKO
Octet
0
1
2
3
4
5
6
7
8
9
10
11
FID
Data
MBC header CRC
Bit
7 6 5 4 3 2 1 0
LB
PF CSBKO
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Octet
0
1
2
3
4
5
6
7
8
9
10
11
FID
Data
Figure 7.11: MBC header message structure
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Bit
7 6 5 4 3 2 1 0
LB
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Data
Bit
7 6 5 4 3 2 1 0
LB
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Data
Figure 7.12: MBC intermediate block message structure
MBC CRC
Bit
7 6 5 4 3 2 1 0
LB
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Data
MBC CRC
Bit
7 6 5 4 3 2 1 0
LB
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Data
Figure 7.13: MBC last block message structure
The MBC contains data (see note 1) that is associated with the CSBK Opcode (CSBKO) and the Feature ID (FID)
combination.
NOTE 2: The DATA information element contains feature specific information and is defined in
TS 102 361-4 [11]. The header block contains 64 bits, an intermediate block contains 95 bits and the last
block contains 79 bits.
NOTE 3: A MBC carries up to 333 bits of data when the header is followed by 3 blocks.
The 16 bit CRC in the header shall include the data carried by the header. The 16 bit CRC in the last block shall be
performed on all MBC blocks except the header block.
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7.4.1 Multi Block Control (MBC)
The MBC header, intermediate and last blocks shall be protected by a BPTC(196,96) FEC, as described in annex B of
the present document.
Before the BPTC(196,96) encoder for the MBC header and the MBC last block, the appropriate Data Type CRC Mask
as defined in clause B.3.12 of the present document shall be applied to the 16 bit CRC. The information bits are carried
in the header, intermediate blocks if necessary and the last block as shown in figures 7.14, 7.15 and 7.16. The Data
Type field of the Slot Type field shall be set to "MBC Header" for the header and "MBC Continuation" for the
intermediate and last blocks.
Figure 7.14: MBC header format
Figure 7.15: MBC intermediate block format
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Figure 7.16: MBC last block format
Table 7.1 relates how the combination of the LB information element and the Data Type is used to distinguish the three
different MBC blocks.
Table 7.1: Data Type information element definitions
Data Type LB Comments
MBC Header
0
2
First Block
MBC Continuation
0
2
Intermediate Blocks
8 DMR Packet Data Protocol (PDP)
This clause defines DMR Packet Data Protocol (PDP) for packet data operation. Data messages of arbitrary length are
transferred over the DMR Air Interface using a packet technique. The present document supports the following layer 3
protocols:
• Internet Protocol.
• 8.1 Short Data Protocol.
8.1 Internet Protocol
The present document supports the Internet Protocol version 4 (IPv4).
NOTE: For detailed description refer to RFC 791 [6].
DMR PDP extends DMR to act as an IP subnet. This enables application programmers to build their applications in a
well standardized environment.
The implementation of BS IP routing and relaying as well as the connection to external networks is outside the scope.
Ipv4 provides a connectionless, best-effort datagram delivery between two service access points. IPv4 protocol is called
on by host-to-host protocols (e.g. TCP, UDP) in an internet environment. IPv4 calls on Air Interface protocol to carry
the IP datagram over the air.
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8.2 Datagram fragmentation and re-assembly
Air Interface Protocol carries the IP datagrams over the air. It provides fragmentation and assembly, error correction
and detection, confirmed delivery, and confidentiality over the air.
An IP datagram that is bigger than a maximum length is first split into fragments. Each fragment is then formed into a
single packet consisting of a sequence of data blocks 1 to m preceded by one or two header blocks. Each block is
protected by its own FEC code. The decomposition of an IP datagram is shown in figure 8.1 where each data packet has
one header block. The transmission may use single slot or dual slot data capability.
IP datagram of arbitrary length
Fragment 1
Block 1 Hdr Block Block m
Break into blocks
Time
1 122 2
1 12 2
Fragment n
Fragment 2
Break into fragments
…..
…..
Block m is the last
data block of a fragment
Building a data packet,
which may have
two header blocks
IP datagram of arbitrary length
Fragment 1
Block 1 Hdr Block Block m
Break into blocks
TimeTime
1 122 2
1 12 2
Fragment n
Fragment 2
Break into fragments
…..
…..
Block m is the last
data block of a fragment
Building a data packet,
which may have
two header blocks
Figure 8.1: Decomposition of datagram into packets
The maximum number of fragments of a single datagram is not bounded. Each fragment length may be variable but
shall not exceed a maximum length of n_DFragMax octets. Each fragment is in turn split into blocks with each block
containing a different number of data octets as shown in the table 8.1.
Table 8.1: Octets per data block
Confirmed/
Unconfirmed
FEC coding rate
Data octects
per block
Confirmed Rate ½ 10
Confirmed Rate ¾ 16
Confirmed Rate 1 22
Unconfirmed Rate ½ 12
Unconfirmed Rate ¾ 18
Unconfirmed Rate 1 24
There is a special block called a header block. One or two header block(s) are sent at the beginning of a data packet.
The maximum number of blocks in a packet, including the header block(s), N_BlockMax is either:
a) for rate ½ coded confirmed data:
ksHeaderBlocN
DFragMaxN
BlockMaxN _1
10
6_
_ ++
⎥
⎥
⎤
⎢
⎢
⎡
−
=
b) for rate ¾ coded confirmed data:
ksHeaderBlocN
DFragMaxN
BlockMaxN _1
16
12_
_ ++
⎥
⎥
⎤
⎢
⎢
⎡
−
=
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c) for rate 1 coded confirmed data:
ksHeaderBlocN
DFragMaxN
BlockMaxN _1
22
18_
_ ++
⎥
⎥
⎤
⎢
⎢
⎡
−
=
d) for rate ½ coded unconfirmed data:
ksHeaderBlocN
DFragMaxN
BlockMaxN _1
12
8_
_ ++
⎥
⎥
⎤
⎢
⎢
⎡
−
=
e) for rate ¾ coded unconfirmed data:
ksHeaderBlocN
DFragMaxN
BlockMaxN _1
18
14_
_ ++
⎥
⎥
⎤
⎢
⎢
⎡
−
=
f) for rate 1 coded unconfirmed data:
ksHeaderBlocN
DFragMaxN
BlockMaxN _1
24
20_
_ ++
⎥
⎥
⎤
⎢
⎢
⎡
−
=
The MS and BS shall have storage for a fragment of at least n_DFragMax octets.
The header block has 4 bit Fragment Sequence Number (FSN) field that helps in reassembly of fragments. For
multi-fragment confirmed data the MSB of the FSN is a flag that indicates the last fragment and the least significant 3
bits are used for the sequence number of the fragments. It starts from value 000
2
and cycles from 001
2
to 111
2
. The
value 000
2
is used only for the first fragment.
The example in table 8.1A shows FSN coding of a multi-fragment confirmed datagram having 14 fragments.
Table 8.1A: FSN coding scheme
Fragment
1 2 3 4 5 6 7 8 9 10 11 12 13 14
FSN
0000
2
0001
2
0010
2
0011
2
0100
2
0101
2
0110
2
0111
2
0001
2
0010
2
0011
2
0100
2
0101
2
1110
2
8.2.1 Header block structure
The header blocks are distinguished from other bursts by the "Data Type" field of the "Slot Type" equal to
"Data Header". The header block contains 10 octets of address and control information, followed by 2 octets of a header
CRC error detection code. The header CRC is calculated from the first 10 octets of address and control using the
cyclical redundant coding procedure commonly referred to as CRC-CCITT as described in clause B.3.8.
Before the BPTC(196,96) encoder, the appropriate Data Type CRC Mask as defined in clause B.3.12 of the present
document shall be applied to the 16 bit CRC.
The structure of the first header block is shown in the figure 8.2. The first header block is always present in a data
packet (including proprietary data packet).
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SYNC or
embedded
signalling (48)
Info (98) Info (98)
Slot Type (10)
Slot Type (10)
Interleaver
BPTC(196, 96) Encoder
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
7
8
9
10
Header CRC
11
Header information
Octet
SYNC or
embedded
signalling (48)
Info (98) Info (98)
Slot Type (10)
Slot Type (10)
Interleaver
BPTC(196, 96) Encoder
SYNC or
embedded
signalling (48)
SYNC or
embedded
signalling (48)
Info (98)Info (98) Info (98)Info (98)
Slot Type (10)
Slot Type (10)
InterleaverInterleaver
BPTC(196, 96) EncoderBPTC(196, 96) Encoder
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
7
8
9
10
Header CRC
11
Header information
Octet
Figure 8.2: Structure of the generic first header block
8.2.1.1 Unconfirmed data Header
The structure of the first header block for an Unconfirmed packet is shown in figure 8.3. Bit 4 of octet 0 shall be the
most significant bit of the 5 bit Pad Octet Count (POC) information element.
G/I
Blocks to Follow
Header CRC
0
0
0
0
FSN
Bit
7 6 5 4 3 2 1 0
POC
G/I HC
SAP
Blocks to Follow
Header CRC
Destination Logical Link ID
Source Logical Link ID
A
DPF
F
0
0
0
0
FSN
POC
Octet
0
1
2
3
4
5
6
7
8
9
10
11
G/I
Blocks to Follow
Header CRC
0
0
0
0
FSN
Bit
7 6 5 4 3 2 1 0
POC
G/I HC
SAP
Blocks to Follow
Header CRC
Destination Logical Link ID
Source Logical Link ID
A
DPF
F
0
0
0
0
FSN
POC
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Figure 8.3: Specific first header block for unconfirmed packet
ETSI
ETSI TS 102 361
-
1 V1.4.5 (2007
-
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71
8.2.1.2 Confirmed data header
The structure of the first header block for a confirmed packet is shown in figure 8.4. Bit 4 of octet 0 shall be the most
significant bit of the 5 bit Pad Octet Count (POC) information element.
G/I
Blocks to Follow
Header CRC
Destination Logical Link ID
Source Logical Link ID
FSN
Bit
7 6 5 4 3 2 1 0
POC
G/I HC
SAP
Blocks to Follow
Header CRC
A
DPF
F
FSN
POC
Octet
0
1
2
3
4
5
6
7
8
9
10
11
S
N(S)
G/I
Blocks to Follow
Header CRC
Destination Logical Link ID
Source Logical Link ID
FSN
Bit
7 6 5 4 3 2 1 0
POC
G/I HC
SAP
Blocks to Follow
Header CRC
A
DPF
F
FSN
POC
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Octet
0
1
2
3
4
5
6
7
8
9
10
11
S
N(S)
Figure 8.4: Specific first header block for confirmed packet
8.2.1.3 Response data header
The structure of the first header block for a response packet is shown in figure 8.5.
G/I
Blocks to Follow
Header CRC
Destination logical link ID
Source logical link ID
Status
Bit
7 6 5 4 3 2 1 0
0
G/I
0
SAP
Blocks to Follow
Header CRC
Destination logical link ID
Source logical link ID
A
DPF
0
0000
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Type
Class
G/I
Blocks to Follow
Header CRC
Destination logical link ID
Source logical link ID
Status
Bit
7 6 5 4 3 2 1 0
0
G/I
0
SAP
Blocks to Follow
Header CRC
Destination logical link ID
Source logical link ID
A
DPF
0
0000
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Type
Class
Figure 8.5: Specific first header block for response packet
8.2.1.4 Proprietary data header
A proprietary data packet uses any data header block as its first header block. It also has a second header block. The
presence of second header block is indicated by the specific value (= 9) of the Service Access Point (SAP) information
element of the first header. The structure of the second header block is shown in the figure 8.6.
ETSI
ETSI TS 102 361
-
1 V1.4.5
(2007
-
12)
72
Header CRC
Bit
7 6 5 4 3 2 1 0
SAP
Header CRC
DPF
Octet
0
1
2
3
4
5
6
7
8
9
10
11
MFID
The structure of
these 8 octets
is defined by
the manufacturer
Header CRC
Bit
7 6 5 4 3 2 1 0
SAP
Header CRC
DPF
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Octet
0
1
2
3
4
5
6
7
8
9
10
11
MFID
The structure of
these 8 octets
is defined by
the manufacturer
Figure 8.6: Second header block of a proprietary packet
8.2.1.5 Status/precoded short data header
The structure of the first header block for a status/precoded short data packet is shown in figure 8.7. Bits 5 and 4 of
octet 0 shall be the 2 most significant bits of the 6 bit AB information element. Bits 1 and 0 of octet 8 shall be the 2
most significant bits of the 10 bit Status/Precoded information element.
G/I
Header CRC
Destination logical link ID
Source logical link ID
Bit
7 6 5 4 3 2 1 0
AB
G/I
SAP
Header CRC
Destination logical link ID
Source logical link ID
A
DPF
Octet
0
1
2
3
4
5
6
7
8
9
10
11
AB
SP
DP
S/P
Status/Precoded
G/I
Header CRC
Destination logical link ID
Source logical link ID
Bit
7 6 5 4 3 2 1 0
AB
G/I
SAP
Header CRC
Destination logical link ID
Source logical link ID
A
DPF
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Octet
0
1
2
3
4
5
6
7
8
9
10
11
AB
SP
DP
S/P
Status/Precoded
Figure 8.7: Specific first header block for status/precoded short data packet
ETSI
ETSI TS 102 361
-
1 V1.4.5 (2007
-
12)
73
8.2.1.6 Raw short data header
The structure of the first header block for a raw short data packet is shown in figure 8.8. Bits 5 and 4 of octet 0 shall be
the 2 most significant bits of the 6 bit AB information element.
G/I
Header CRC
Destination logical link ID
Source logical link ID
Bit
7 6 5 4 3 2 1 0
AB
G/I
SAP
Header CRC
Destination logical link ID
Source logical link ID
A
DPF
Octet
0
1
2
3
4
5
6
7
8
9
10
11
AB
SP
DP
Bit Padding
F
S
G/I
Header CRC
Destination logical link ID
Source logical link ID
Bit
7 6 5 4 3 2 1 0
AB
G/I
SAP
Header CRC
Destination logical link ID
Source logical link ID
A
DPF
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Octet
0
1
2
3
4
5
6
7
8
9
10
11
AB
SP
DP
Bit Padding
F
S
Figure 8.8: Specific first header block for raw short data packet
8.2.1.7 Defined short data header
The structure of the first header block for a defined short data packet is shown in figure 8.9. Bits 5 and 4 of octet 0 shall
be the 2 most significant bits of the 6 bit AB information element.
G/I
Header CRC
Destination logical link ID
Source logical link ID
Bit
7 6 5 4 3 2 1 0
AB
G/I
SAP
Header CRC
Destination logical link ID
Source logical link ID
A
DPF
Octet
0
1
2
3
4
5
6
7
8
9
10
11
AB
DD Format
Bit Padding
F
S
G/I
Header CRC
Destination logical link ID
Source logical link ID
Bit
7 6 5 4 3 2 1 0
AB
G/I
SAP
Header CRC
Destination logical link ID
Source logical link ID
A
DPF
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Octet
0
1
2
3
4
5
6
7
8
9
10
11
AB
DD Format
Bit Padding
F
S
Figure 8.9: Specific first header block for defined short data packet
ETSI
ETSI TS 102 361
-
1 V1.4.5 (2007
-
12)
74
8.2.1.8 Unified Data Transport (UDT) data header
The structure of the first header block UDT data packet is shown in figure 8.10.
G/I
Header CRC
Destination logical link ID
Source logical link ID
Bit
7 6 5 4 3 2 1 0
0
G/I
SAP
Header CRC
Destination logical link ID
Source logical link ID
A
DPF
Octet
0
1
2
3
4
5
6
7
8
9
10
11
UDT Format
Pad Nibble UAB
SF
0
0
PF
UDTO
G/I
Header CRC
Destination logical link ID
Source logical link ID
Bit
7 6 5 4 3 2 1 0
0
G/I
SAP
Header CRC
Destination logical link ID
Source logical link ID
A
DPF
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Octet
0
1
2
3
4
5
6
7
8
9
10
11
UDT Format
Pad Nibble UAB
SF
0
0
PF
UDTO
Figure 8.10: Specific first header block for UDT data packet
8.2.2 Data block structure
A data packet is protected by a 32-bit CRC over the data contents to allow the recipient to determine if the packet has
been received without error. This CRC is positioned at the end of the packet, as the last four octets in the last block of
the packet. This is referred to as the packet CRC and described in clause B.3.9. Additional octets may be appended to
the end of the data in the packet, but before the CRC, to extend the total packet length to exactly fill all of the blocks in
the packet. The number of additional octets is indicated by the Pad Octet Count field of the first header block. The
service required to process the data packet is indicated by the SAP of the preceding header. The value of SAP for IP
based packet is 4.
The number of blocks in the packet excluding the first header block is indicated in the header block by the field blocks
to follow.
Data may be sent with either confirmed delivery or unconfirmed delivery. Confirmed delivery is used to require the
recipient of the packet to send an acknowledgment of receipt. Unconfirmed delivery is used if the originator of the
packet does not require an acknowledgment. The distinction between confirmed and unconfirmed packet is indicated in
the Data Packet Format (DPF) field of the header block.
8.2.2.1 Unconfirmed data block structure
The unconfirmed data blocks follow an unconfirmed data header. The data type information element of the SLOT PDU
may be either "rate ½ coded",or "rate ¾ rate coded" or "rate 1 coded". During a data transmission the data type
information element in the SLOT PDU of the data blocks and therefore the coding rate of the data blocks shall not
change. Unconfirmed data blocks using rate ½ coding are packets with 12 octets in each block, where each block is
protected with a BPTC(196, 96) code. The last block shall contain a data CRC in the last four octets. The formula for
the number of octets of user data is as follows:
Number Data Octets = 12 × (Blocks To Follow - no. of additional headers) - 4 - Pad Octet Count
ETSI
ETSI TS 102 361
-
1 V1.4.5 (2007
-
12)
75
The Unconfirmed data block format when using rate ½ coding is shown in figure 8.11.
Slot Type (10)
Slot Type (10)
Interleaver
BPTC(196,96) Encoder
SYNC or
embedded
signaling (48)
Info (98)
Info (98)
Octet
Non-last data block Last data blockOR
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
10
11
Octet
User data
(the second last block may
contain pad octets
If pad octets > 8)
8
9
7
7 6 5 4 3 2 1 0
0
1
2
3
4
5
10
Fragment CRC
11
User data
followed by
pad octets
9
8
7
6
Slot Type (10)
Slot Type (10)
Interleaver
BPTC(196,96) Encoder
SYNC or
embedded
signaling (48)
Info (98)
Info (98)
Slot Type (10)
Slot Type (10)
InterleaverInterleaver
BPTC(196,96) EncoderBPTC(196,96) Encoder
SYNC or
embedded
signaling (48)
SYNC or
embedded
signaling (48)
Info (98)Info (98)
Info (98)Info (98)
Octet
Non-last data block Last data blockOR
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
10
11
Octet
User data
(the second last block may
contain pad octets
If pad octets > 8)
8
9
7
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
10
11
Octet
User data
(the second last block may
contain pad octets
If pad octets > 8)
8
9
7
7 6 5 4 3 2 1 0
0
1
2
3
4
5
10
Fragment CRC
11
User data
followed by
pad octets
9
8
7
6
7 6 5 4 3 2 1 0
0
1
2
3
4
5
10
Fragment CRC
11
User data
followed by
pad octets
9
8
7
6
Figure 8.11: Unconfirmed rate ½ coded data block format
Unconfirmed data blocks using rate ¾ coding are packets with 18 octets in each block, where each block is protected
with a rate ¾ Trellis code. The Last Block shall contain a data CRC in the last four octets. The formula for the number
of octets of user data is as follows:
Number Data Octets = 18 × (Blocks To Follow - no. of additional headers) - 4 - Pad Octet Count
The Unconfirmed data block format when using rate ¾ coding is shown in figure 8.11A.
ETSI
ETSI TS 102 361
-
1 V1.4.5 (2007
-
12)
76
Slot Type (10)
Slot Type (10)
Interleaver
Rate 3/4 Trellis Encoder
SYNC or
embedded
signaling (48)
Info (98)
Info (98)
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
16
17
Octet
User data
(the second last block may
contain pad octets
If pad octets > 14)
Octet
7 6 5 4 3 2 1 0
0
1
2
3
4
5
16
Fragment CRC
17
User data
followed by
pad octets
15
14
13
etc.
14
15
etc.
Non-last data block Last data blockOR
Slot Type (10)
Slot Type (10)
Interleaver
Rate 3/4 Trellis Encoder
SYNC or
embedded
signaling (48)
Info (98)
Info (98)
Slot Type (10)
Slot Type (10)
InterleaverInterleaver
Rate 3/4 Trellis EncoderRate 3/4 Trellis Encoder
SYNC or
embedded
signaling (48)
SYNC or
embedded
signaling (48)
Info (98)Info (98)
Info (98)Info (98)
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
16
17
Octet
User data
(the second last block may
contain pad octets
If pad octets > 14)
Octet
7 6 5 4 3 2 1 0
0
1
2
3
4
5
16
Fragment CRC
17
User data
followed by
pad octets
15
14
13
etc.
14
15
etc.
Non-last data block Last data blockOR
Figure 8.11A: Unconfirmed rate ¾ coded data block format
Unconfirmed data blocks using rate 1 coding are packets with 24 octets in each block, where each block is uncoded.
The Last Block shall contain a data CRC in the last four octets. The formula for the number of octets of user data is as
follows:
Number Data Octets = 24 × (Blocks To Follow - no. of additional headers) - 4 - Pad Octet Count
ETSI
ETSI TS 102 361
-
1 V1.4.5 (2007
-
12)
77
The Unconfirmed data block format when using rate 1 coding is shown in figure 8.11B.
Slot Type (10)
Slot Type (10)
Rate 1 - Uncoded
SYNC or
embedded
signaling (48)
Info (98)
Info (98)
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
22
23
Octet
User data
(the second last block may
contain pad octets
If pad octets > 20)
Octet
7 6 5 4 3 2 1 0
0
1
2
3
4
5
22
Fragment CRC
23
User data
followed by
pad octets
21
20
19
etc.
20
21
etc.
Non-last data block Last data blockOR
Slot Type (10)
Slot Type (10)
Rate 1 - UncodedRate 1 - Uncoded
SYNC or
embedded
signaling (48)
SYNC or
embedded
signaling (48)
Info (98)Info (98)
Info (98)Info (98)
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
22
23
Octet
User data
(the second last block may
contain pad octets
If pad octets > 20)
Octet
7 6 5 4 3 2 1 0
0
1
2
3
4
5
22
Fragment CRC
23
User data
followed by
pad octets
21
20
19
etc.
20
21
etc.
Non-last data block Last data blockOR
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
22
23
Octet
User data
(the second last block may
contain pad octets
If pad octets > 20)
Octet
7 6 5 4 3 2 1 0
0
1
2
3
4
5
22
Fragment CRC
23
User data
followed by
pad octets
21
20
19
etc.
20
21
etc.
Non-last data block Last data blockOR
Figure 8.11B: Unconfirmed rate 1 coded data block format
8.2.2.2 Confirmed data block structure
The Confirmed data blocks follow a Confirmed Data Header. The Data Type information element of the SLOT PDU
may be either "rate ½ coded",or "rate ¾ rate coded" or "rate 1 coded". During a data transmission the Data Type
information element of the SLOT PDU of the data blocks and therefore the coding rate of the data blocks shall not
change. In the case of confirmed delivery using rate ¾ coding, a data block contains 16 octets of data, and two octets of
control data (a 7-bit block serial number and a 9-bit CRC). The 9-bit CRC is calculated over 7-bit data block serial
number concatenated with user data in the block. Each block in the packet, when using rate ¾ coding, is protected with
a rate ¾ Trellis code. The formula for the number of octets of user data is as follows:
Number Data Octets = 16 × (Blocks To Follow - no. of additional headers) - 4 - Pad Octet Count
ETSI
ETSI TS 102 361
-
1 V1.4.5 (2007
-
12)
78
The Confirmed data block format when using rate ¾ coding is shown in figure 8.12.
Slot Type (10)
Slot Type (10)
Interleaver
Rate 3/4 Trellis Encoder
SYNC or
embedded
signaling (48)
Info (98)
Info (98)
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
16
17
Octet
User data
(the second last block may
contain pad octets
If pad octets > 12)
Data block serial number
9-bit CRC
Octet
7 6 5 4 3 2 1 0
0
1
2
3
4
5
16
Fragment CRC
17
User data
followed by
pad octets
Data block serial number
9-bit CRC
15
14
13
etc.
14
15
etc.
Non-last data block Last data blockOR
Slot Type (10)
Slot Type (10)
Interleaver
Rate 3/4 Trellis Encoder
SYNC or
embedded
signaling (48)
Info (98)
Info (98)
Slot Type (10)
Slot Type (10)
InterleaverInterleaver
Rate 3/4 Trellis EncoderRate 3/4 Trellis Encoder
SYNC or
embedded
signaling (48)
SYNC or
embedded
signaling (48)
Info (98)Info (98)
Info (98)Info (98)
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
16
17
Octet
User data
(the second last block may
contain pad octets
If pad octets > 12)
Data block serial number
9-bit CRC
Octet
7 6 5 4 3 2 1 0
0
1
2
3
4
5
16
Fragment CRC
17
User data
followed by
pad octets
Data block serial number
9-bit CRC
15
14
13
etc.
7 6 5 4 3 2 1 0
0
1
2
3
4
5
16
Fragment CRC
17
User data
followed by
pad octets
Data block serial number
9-bit CRC
15
14
13
etc.
14
15
etc.
Non-last data block Last data blockOR
Figure 8.12: Confirmed rate ¾ coding data block format
In the case of confirmed delivery using rate ½ coding, a data block contains 10 octets of data, and two octets of control
data (a 7-bit block serial number and a 9-bit CRC). The 9-bit CRC is calculated over 7-bit data block serial number
concatenated with user data in the block.
Before the FEC encoder, the appropriate Data Type CRC Mask as defined in clause B.3.12 of the present document
shall be applied to the 9 bit CRC. Each block in the packet, when using rate ½ coding, is protected with a
BPTC(196, 96) code. The formula for the number of octets of user data is as follows:
Number Data Octets = 10 × (Blocks To Follow - no. of additional headers) - 4 - Pad Octet Count.
The Confirmed data block format when using rate ½ coding is shown in figure 8.12A.
ETSI
ETSI TS 102 361
-
1 V
1.4.5 (2007
-
12)
79
Slot Type (10)
Slot Type (10)
Interleaver
BPTC(196,96) Encoder
SYNC or
embedded
signaling (48)
Info (98)
Info (98)
Octet
Non-last data block Last data blockOR
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
10
11
Octet
User data
(the second last block may
contain pad octets
If pad octets > 6)
8
9
7
7 6 5 4 3 2 1 0
0
1
2
3
4
5
10
Fragment CRC
11
User data
followed by
pad octets
9
8
7
6
Data block serial number
Data block serial number
9-bit CRC
9-bit CRC
Slot Type (10)
Slot Type (10)
Interleaver
BPTC(196,96) Encoder
SYNC or
embedded
signaling (48)
Info (98)
Info (98)
Slot Type (10)
Slot Type (10)
InterleaverInterleaver
BPTC(196,96) EncoderBPTC(196,96) Encoder
SYNC or
embedded
signaling (48)
SYNC or
embedded
signaling (48)
Info (98)Info (98)
Info (98)Info (98)
Octet
Non-last data block Last data blockOR
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
10
11
Octet
User data
(the second last block may
contain pad octets
If pad octets > 6)
8
9
7
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
10
11
Octet
User data
(the second last block may
contain pad octets
If pad octets > 6)
8
9
7
7 6 5 4 3 2 1 0
0
1
2
3
4
5
10
Fragment CRC
11
User data
followed by
pad octets
9
8
7
6
7 6 5 4 3 2 1 0
0
1
2
3
4
5
10
Fragment CRC
11
User data
followed by
pad octets
9
8
7
6
Data block serial number
Data block serial number
9-bit CRC
9-bit CRC
Figure 8.12A: Confirmed rate ½ coding data block format
In the case of confirmed delivery using rate 1 coding, a data block contains 22 octets of data, and two octets of control
data (a 7-bit block serial number and a 9-bit CRC). The 9-bit CRC is calculated over 7-bit data block serial number
concatenated with user data in the block.
Before the FEC encoder, the appropriate Data Type CRC Mask as defined in clause B.3.12 of the present document
shall be applied to the 9-bit CRC. Each block in the packet, when using rate 1 coding, is unprotected. The formula for
the number of octets of user data is as follows:
Number Data Octets = 22 × (Blocks To Follow - no. of additional headers) - 4 - Pad Octet Count.
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The Confirmed data block format when using rate 1 coding is shown in figure 8.12B.
Slot Type (10)
Slot Type (10)
Rate 1 - Uncoded
SYNC or
embedded
signaling (48)
Info (98)
Info (98)
Octet
Non-last data block Last data blockOR
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
22
23
Octet
User data
(the second last block may
contain pad octets
If pad octets > 18)
20
21
etc.
7 6 5 4 3 2 1 0
0
1
2
3
4
5
22
Fragment CRC
23
User data
followed by
pad octets
21
20
6
Data block serial number
Data block serial number
9-bit CRC
9-bit CRC
etc.
Slot Type (10)
Slot Type (10)
Rate 1 - UncodedRate 1 - Uncoded
SYNC or
embedded
signaling (48)
SYNC or
embedded
signaling (48)
Info (98)Info (98)
Info (98)Info (98)
Octet
Non-last data block Last data blockOR
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
22
23
Octet
User data
(the second last block may
contain pad octets
If pad octets > 18)
20
21
etc.
7 6 5 4 3 2 1 0
0
1
2
3
4
5
22
Fragment CRC
23
User data
followed by
pad octets
21
20
6
Data block serial number
Data block serial number
9-bit CRC
9-bit CRC
etc.
Octet
Non-last data block Last data blockOR
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
22
23
Octet
User data
(the second last block may
contain pad octets
If pad octets > 18)
20
21
etc.
7 6 5 4 3 2 1 0
0
1
2
3
4
5
22
Fragment CRC
23
User data
followed by
pad octets
21
20
6
Data block serial number
Data block serial number
9-bit CRC
9-bit CRC
etc.
Figure 8.12B: Confirmed rate 1 coding data block format
The block serial number and CRC allow the recipient to distinguish the data blocks that were received correctly. In case
of confirmed delivery, the recipient sends an acknowledgment back to the sender to request a retransmission of only the
corrupted blocks. This is called selective ARQ.
The block serial number is used to distinguish a corrupted block. The serial number of the data blocks of a packet start
at 0 and increment up to (Blocks To Follow - numbers of headers). On subsequent retries, the sender sends the
corrupted blocks with their serial numbers.
8.2.2.3 Response packet format
The Response packet is used to confirm the delivery of confirmed data packets. The recipient sends a response packet
when "A" bit (in the header block) of the received packet is set. The response packet header block is shown in
figure 8.5.
The Class, Type and Status field in the header block of a response packet specifies the meaning of the response as
shown in table 8.2.
In the case where blocks are to be selectively retried, the Class field shall be set to 10
2
, and subsequent blocks of
additional information are appended to the header block. The number of blocks is indicated in the Blocks To Follow
field. The format for data blocks is shown in figure 8.13 for the case where only a single data block follows the
response packet header. It contains selective retry flags for up to 64 blocks. If more flags are necessary, then two blocks
may be used and flags for up to 127 blocks are sent. The data blocks of the Response packet are distinguished from
other bursts by the "Data Type" field of the "Slot Type" equal to "Unconfirmed Data Continuation".
A flag bit is set to 1
2
to indicate the receipt of the corresponding block, and is set to 0
2
to indicate that the block should
be retried. The position of a flag bit indicates its corresponding block. Unused flag bits, i.e. the flag bits whose position
number is more than the number of blocks used in the packet shall be set to 1
2
.
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Table 8.2: Response Packet Class, Type, and Status definitions
Class Type Status Message Comment
00
2
001
2
NI ACK All blocks of all packets up to NI are successfully received
01
2
000
2
NI NACK Illegal format, NI may have no real meaning
01
2
001
2
NI NACK Packet CRC of a packet with NI failed
01
2
010
2
NI NACK Memory of the recipient is full
01
2
011
2
FSN NACK The received FSN is out of sequence
01
2
100
2
NI NACK Undeliverable
01
2
101
2
VI NACK The received packet is out of sequence, N(S)
≠
VI or VI + 1
01
2
110
2
NI NACK Invalid user disallowed by the system
10
2
000
2
NI SACK The recipient requests the selective retry of the blocks indicated in the
data block of the response packet
NOTE 1: NI is the sequence number of the last packet successfully received by the recipient.
NOTE 2: N(S) is the sequence number of the last packet sent by the sender.
NOTE 3: VI is the sequence number of the packet expected by the recipient.
NOTE 4: The FSN are the three least significant bits of the FSN field.
NOTE 5: TS 102 361-3 [12] provides bearer service specific information on the use of the information elements.
The CRC is the 32-bits CRC defined in clause B.3.9.
Bit
7 6 5 4 3 2 1 0
CRC
Octet
0
1
2
3
4
5
6
7
8
9
10
11
7 6 5 4 3 2 1 0
15 14 13 12 11 10 9 8
19 18 17 16
26 25 24
33 32
Bit
7 6 5 4 3 2 1 0
CRC
Octet
0
1
2
3
4
5
6
7
8
9
10
11
Octet
0
1
2
3
4
5
6
7
8
9
10
11
7 6 5 4 3 2 1 0
15 14 13 12 11 10 9 8
19 18 17 16
26 25 24
33 32
Figure 8.13: Response packet data block
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8.2.2.4 Hang time for response packet
A receiving MS needs to send a response packet on receipt of a confirmed data packet. To ensure an immediate
transmission of the response packet, the system reserves the channel for the response packet. This is called
"data response hang time". The data response hang time is normally few bursts after the end of a data packet. In direct
mode, it is the responsibility of the sending MS to indicate the start of the data response hang time by transmitting a
"Data Terminator LC". The recipient should send the response politely.
To distinguish the Data Terminator LC from other bursts, the Data Type information element of the SLOT PDU shall
be set to "Terminator with LC".
In repeater mode, it is the responsibility of a BS to indicate the data response hang time by transmitting a configurable
number of "Data Terminator LC". To avoid collision, the repeater should also set the CACH's AT bits to BUSY during
the data response hang time. A MS should send a response packet impolitely during its "data response hang time". The
figure 8.14 shows the structure of the "Data Terminator LC".
Destination logical link ID
Source logical link ID
Bit
7 6 5 4 3 2 1 0
R
G/I
FID
Destination logical link ID
Source logical link ID
A
FLCO
Octet
0
1
2
3
4
5
6
7
8
PF
N(S)
0
F
S
Destination logical link ID
Source logical link ID
Bit
7 6 5 4 3 2 1 0
R
G/I
FID
Destination logical link ID
Source logical link ID
A
FLCO
Octet
0
1
2
3
4
5
6
7
8
Octet
0
1
2
3
4
5
6
7
8
PF
N(S)
0
F
S
Figure 8.14: Data Terminator Link Control.
8.2.2.5 Unified Data Transport (UDT) last data block structure
The UDT data blocks follow an UDT Data Header. The data type information element of the SLOT PDU shall be "rate
½ coded". Unconfirmed data blocks using rate ½ coding are packets with 12 octets in each block, where each block is
protected with a BPTC(196, 96) code. The last block shall contain a data CRC in the last two octets.
The UDT last data block format when using rate ½ coding is shown in figure 8.15.
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SYNC or
embedded
signalling (48)
Info (98) Info (98)
Slot Type (10)
Slot Type (10)
Interleaver
BPTC(196, 96) Encoder
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
7
8
9
10
Message CRC
11
User data
followed by
pad octets
Octet
SYNC or
embedded
signalling (48)
Info (98) Info (98)
Slot Type (10)
Slot Type (10)
Interleaver
BPTC(196, 96) Encoder
SYNC or
embedded
signalling (48)
SYNC or
embedded
signalling (48)
Info (98)Info (98) Info (98)Info (98)
Slot Type (10)
Slot Type (10)
InterleaverInterleaver
BPTC(196, 96) EncoderBPTC(196, 96) Encoder
7 6 5 4 3 2 1 0
0
1
2
3
4
5
6
7
8
9
10
Message CRC
11
User data
followed by
pad octets
Octet
Figure 8.15: UDT last data block form
9 Layer 2 PDU description
This clause describes the PDUs which apply to the DMR Air Interface layer 2.
The following clauses contain descriptions of the PDUs and the information elements contained within them. The
structure of the PDU definition represented by the tables is as follows:
• the information element column gives the name of the contained element(s);
• the element length column defines the length of the element in bits;
• the remarks column contains other information on the information element.
The elements shall be transmitted in the order specified by the burst format with the top element of the table being
transmitted first (before interleaving). The content of an information element is represented by a binary value and the
Most Significant Bit (MSB) of that binary value shall be transmitted first (before interleaving).
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9.1 PDUs for voice bursts, general data bursts and the CACH
9.1.1 Synchronization (SYNC) PDU
Frame synchronization is the initial step to receiving a message and shall be achieved before the embedded fields can be
extracted, parsed and interpreted. The TDMA protocol consists of inbound voice, outbound voice, inbound data or
control and outbound data or control modes. Different frame synchronization patterns will be used to distinguish these
various modes. Using the initial synchronization to carry additional information to indicate these modes will reduce the
number of required dedicated signalling bits in the burst structure.
The content of the SYNC PDU is shown in table 9.1.
Table 9.1: SYNC PDU
Information element Length Remark
SYNC 48 The synchronization pattern is defined in table 9.2
DMR shall have a SYNC pattern as shown in table 9.2.
NOTE: The TDMA protocol defines a unique 48-bit frame SYNC patterns for voice and data, they are the
symbol-wise complement of each other. The frame SYNC correlator will find a positive result for voice
mode and an equal but negative result for data when running a single correlator.
Table 9.2: SYNC patterns
BS sourced
Hex 7 5 5 F D 7 D F 7 5 F 7
Voice
Binary 0111 0101 0101 1111 1101 0111 1101 1111 0111 0101 1111 0111
Hex D F F 5 7 D 7 5 D F 5 D
Data
Binary 1101 1111 1111 0101 0111 1101 0111 0101 1101 1111 0101 1101
MS sourced
Hex 7 F 7 D 5 D D 5 7 D F D
Voice
Binary 0111 1111 0111 1101 0101 1101 1101 0101 0111 1101 1111 1101
Hex D 5 D 7 F 7 7 F D 7 5 7
Data
Binary 1101 0101 1101 0111 1111 0111 0111 1111 1101 0111 0101 0111
Hex 7 7 D 5 5 F 7 D F D 7 7 RC
sync
Binary 0111 0111 1101 0101 0101 1111 0111 1101 1111 1101 0111 0111
Reserved SYNC pattern
Hex D D 7 F F 5 D 7 5 7 D D
(See note)
Binary 1101 1101 0111 1111 1111 0101 1101 0111 0101 0111 1101 1101
NOTE: The Reserved SYNC pattern is for future use.
9.1.2 Embedded signalling (EMB) PDU
The EMB PDU shall be used for embedded signalling within a burst. The EMB PDU has a length of 16 bits and is
placed in the burst as shown in clause 6.1. The content of the EMB PDU is shown in table 9.3.
Table 9.3: EMB PDU content
Information element Length Remark
Colour Code (CC) 4
Privacy Indicator (PI) 1 (see note)
Link Control Start/Stop (LCSS) 2
EMB parity 9 The Quadratic Residue (16,7,6) FEC shall be used as
described in clause B.3.2
NOTE: PI is not defined in the present document, see clause 9.3.2.
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9.1.3 Slot Type (SLOT) PDU
The SLOT PDU shall be used for data and control. The SLOT PDU has a length of 20 bits and is placed in the burst as
shown in clause 6.2. The content of the SLOT PDU is shown in table 9.4.
Table 9.4: SLOT PDU content
Information element Length Remark
Colour Code (CC) 4
Data Type 4
Slot Type parity 12 The Golay (20,8) FEC shall be used as described in clause B.3.1
9.1.4 TACT PDU
The TACT PDU shall be used for framing and status of the CACH burst. The TACT PDU has a length of 7 bits,
preceding the CACH signalling. The content of the TACT PDU is shown in table 9.5.
Table 9.5: TACT PDU content
Information element Length Remark
Access Type (AT) 1 In continuous transmission mode, for both voice and data, the AT bit is
set to 1
TDMA Channel (TC) 1
Link Control Start/Stop (LCSS) 2
TACT parity 3 The Hamming (7,4) FEC shall be used as described in clause B.3.5
9.1.5 Reverse Channel (RC) PDU
The RC PDU shall be used for RC signalling. The RC PDU has a length of 32 bits and embedded in the RC burst as
described in clause 6.4. The content of the RC PDU is shown in table 9.6.
Table 9.6: RC PDU content
Information element Length Remark
RC Info 11
RC parity 21 A variable BPTC FEC shall be used as described in clause B.2.2
9.1.6 Full Link Control (FULL LC) PDU
The FULL LC PDU shall be used as described in clause 7.1. The FULL LC PDU has a length of either 96 bits for
header and terminator bursts or 77 bits for embedded signalling. The content of the FULL LC PDU is shown in
table 9.7.
Table 9.7: FULL LC PDU content
Information element Length Remark
Protect Flag (PF) 1
Reserved 1
Full Link Control Opcode
(FLCO)
6
Feature set ID (FID) 8 The FID shall be either SFID or MFID, see clause 9.3.13
Full LC Data 56 (see note 1)
Full LC CRC (see note 2) Either a Reed-Solomon (12,9) FEC for header and terminator
burst, as described in clause B.3.6, or a 5 bit checksum for
embedded signalling, as described in clause B.3.11, shall be used
NOTE 1: The data information element is defined by the feature protocol document TS 102 361-2 [5].
NOTE 2: The length is either 24 bits for header and terminator bursts or 5 bits for embedded signalling.
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9.1.7 Short Link Control (SHORT LC) PDU
The SHORT LC PDU shall be used as described in clause 7.1. The SHORT LC PDU has a length of 36 bits. The
content of the SHORT LC PDU is shown in table 9.8.
Table 9.8: SHORT LC PDU content
Information element Length Remark
Short LC Opcode (SLCO) 4
Short LC Data 24 (see note)
Short LC CRC 8 The 8 bit CRC shall be used as described in clause B.3.7
NOTE: The data information element is defined in TS 102 361-2 [5].
9.1.8 Control Signalling Block (CSBK) PDU
The CSBK PDU shall be used for signalling as described in clause 7.2. A single CSBK PDU has a length of 96 bits.
This CSBK PDU is shown in table 9.9.
Table 9.9: CSBK PDU content
Information element Length Remark
Last Block 1 This bit shall be set to 1
Protect Flag 1
CSBK Opcode (CSBKO) 6
FID 8 The FID shall be either SFID or MFID, see clause 9.3.13
CSBK Data 64 See note
CSBK CRC 16 The CRC-CCITT shall be used as described in clause B.3.8
NOTE: The data information element is defined by TS 102 361-2 [5].
9.1.9 Pseudo Random Fill Bit (PR FILL) PDU
The Pseudo Random Fill Bit (PR FILL) PDU shall be used for Idle messages as described in clause 7.3. The PR FILL
PDU has a length of 96 bits. The calculation of these bits is described in clause D.2.
9.2 Data related PDU description
This clause describes the PDUs related to the packet data protocol which apply to the DMR Air Interface layer 2.
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9.2.1 Confirmed packet Header (C_HEAD) PDU
The C_HEAD PDU shall be used for confirmed data delivery as described in clause 8.2.1. The C_HEAD PDU has a
length of 96 bits as shown in table 9.10.
Table 9.10: C_HEAD PDU content
Information element Length Remark
Group or Individual 1 This bit is set to indicate that the destination LLID is for a group
Response Requested (A) 1
Header Compression (HC) 1
Format 4 Data packet identification
SAP Identifier 4
Pad Octet Count (POC) 5
Logical Link ID (LLID) 24 Destination
Logical Link ID (LLID) 24 Source
Full Message Flag (FMF) 1
Blocks to Follow (BF) 7
Re-Synchronize flag (S) 1
Send sequence Number (N(S)) 3
Fragment Sequence Number (FSN) 4
Header CRC 16 The CRC-CCITT shall be used as described in clause B.3.8
9.2.2 Rate ¾ coded packet Data (R_3_4_DATA) PDU
The R_3_4-_DATA PDU is used to carry user data for confirmed data delivery as described in clause 8.2.2.2. The
R_3_4_DATA PDU, when used for confirmed data, has a length of 144 bits as shown in table 9.11.
Table 9.11: R_3_4_DATA PDU content for confirmed data
Information element Length Remark
Data Block Serial Number (DBSN) 7
C-DATA CRC 9 The CRC-9 shall be used for DBSN and user data as described in
clause B.3.10
User Data 128 The user data field may contain pad octets
The R_3_4_DATA PDU is used to carry user data for unconfirmed data delivery as described in clause 8.2.2.1. This
PDU, when used for unconfirmed data, uses all 144 bits for User Data as shown in table 9.11A.
Table 9.11A: R_3_4_DATA PDU content for unconfirmed data
Information element Length Remark
User Data 144 The user data field may contain pad octets
9.2.3 Rate ¾ coded Last Data block (R_3_4_LDATA) PDU
The R_3_4_LDATA PDU is used as the last data block carrying user data for confirmed data delivery as described in
clause 8.2.2.2. The R_3_4_LDATA PDU, when used for confirmed data, has a length of 144 bits as shown in
table 9.12.
Table 9.12: R_3_4_LDATA PDU content for confirmed data
Information element Length Remark
Data Block Serial Number (DBSN) 7
C-DATA CRC 9 The CRC-9 shall be used for DBSN and user data as described in
clause B.3.10
User Data 96 The user data field may contain up to 12 pad octets
Message CRC 32 The 32-bit CRC shall be used for the data message as described
in clause B.3.9
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The R_3_4_LDATA PDU is used to carry user data for unconfirmed data delivery as described in clause 8.2.2.1. This
PDU, when used for unconfirmed data, has a length of 144 bits as shown in table 9.12A.
Table 9.12A: R_3_4_LDATA PDU content for unconfirmed data
Information element Length Remark
User Data 112 The user data field may contain up to 14 pad octets
Message CRC 32 The 32-bit CRC shall be used for the data message as described
in clause B.3.9
9.2.4 Confirmed Response packet Header (C_RHEAD) PDU
The C_RHEAD PDU shall be used as the header to confirm delivery as described in clauses 8.2.1 and 8.2.2.3. The
C_RHEAD PDU has a length of 96 bits as shown in table 9.13.
Table 9.13: C_RHEAD PDU content
Information element Length Remark
Reserved 1 This bit shall be set to 0
Response Requested (A) 1 This bit shall be set to 0
Reserved 1 This bit shall be set to 0
Format 4 Data packet identification
SAP Identifier 4
Pad Octet Count (POC) 5
Logical Link ID (LLID) 24 Destination
Logical Link ID (LLID) 24 Source
Full Message Flag (FMF) 1 This bit shall be set to 0
Blocks to Follow (BF) 7
Class 2
Type 3
Status 3
Header CRC 16 The CRC-CCITT shall be used as described in clause B.3.8
9.2.5 Confirmed Response packet Data (C_RDATA) PDU
The C_RDATA PDU shall be used to identify data blocks to be selectively retried as described in clause 8.2.2.3. The
C_RDATA PDU has a length of 96 bits as shown in table 9.14.
Table 9.14: C_RDATA PDU content
Information element Length Remark
Retry Flags (RF) 64 Unused flag bits and bits corresponding to blocks with numbers
higher than are used in the packet, shall be set to 1
2
Response CRC 32 The 32-bit CRC shall be used as described in clause B.3.9
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9.2.6 Unconfirmed data packet Header (U_HEAD) PDU
The U_HEAD PDU shall be used for unconfirmed data delivery as described in clause 8.2.1. The U_HEAD PDU has a
length of 96 bits as shown in table 9.15.
Table 9.15: U_HEAD PDU content
Information element Length Remark
Group or Individual 1 This bit is set to indicate that the destination LLID is for a group
Response Requested (A) 1 This bit shall be set to 0
Header Compression (HC) 1
Format 4 Data packet identification
SAP Identifier 4
Pad Octet Count (POC) 5
Logical Link ID (LLID) 24 Destination
Logical Link ID (LLID) 24 Source
Full Message Flag (FMF) 1 This bit shall be set to 1
Blocks to Follow (BF) 7
Reserved 4 These bits shall be set to 0
Fragment Sequence Number
(FSN)
4
Header CRC 16 The CRC-CCITT shall be used as described in clause B.3.8
9.2.7 Rate ½ coded packet Data (R_1_2_DATA) PDU
The R_1_2_DATA PDU is used to carry user data for confirmed data delivery as described in clause 8.2.2.2. The
R_1_2_DATA PDU, when used for confirmed data, has a length of 96 bits as shown in table 9.15A.
Table 9.15A: R_1_2_DATA PDU content for confirmed data
Information element Length Remark
Data Block Serial Number (DBSN) 7
C-DATA CRC 9 The CRC-9 shall be used for DBSN and user data as described in
clause B.3.10
User Data 80 The user data field may contain pad octets
The R_1_2_DATA PDU is used to follow the unconfirmed packet header carrying only user data information as
described in clause 8.2.2.1. The R_1_2_DATA PDU, when used for unconfirmed data, has a length of 96 bits and may
contain pad octets as shown in table 9.15AA.
Table 9.15AA: R_1_2_DATA PDU content for unconfirmed data
Information element Length Remark
User Data 96 The user data field may contain pad octets
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9.2.8 Rate ½ coded Last Data block (R_1_2_LDATA) PDU
The R_1_2_LDATA PDU is used as the last data block carrying user data for confirmed data delivery as described in
clause 8.2.2.2. The R_1_2_LDATA PDU, when used for confirmed data, has a length of 96 bits as shown in
table 9.15B.
Table 9.15B: R_1_2_LDATA PDU content for confirmed data
Information element Length Remark
Data Block Serial Number (DBSN) 7
C-DATA CRC 9 The CRC-9 shall be used for DBSN and user data as described in
clause B.3.10
User Data 48 The user data field may contain up to 6 pad octets
Message CRC 32 The 32-bit CRC shall be used for the data message as described
in clause B.3.9
The R_1_2_LDATA PDU is used as the last data block carrying user data for unconfirmed data delivery as described in
clause 8.2.2.1. The R_1_2_LDATA PDU, when used for unconfirmed data, has a length of 96 bits as shown in
table 9.16.
Table 9.16: R_1_2_LDATA PDU content for unconfirmed data
Information element Length Remark
User Data 64 (see note)
Message CRC 32 The 32-bit CRC shall be used for the data message as described
in clause B.3.9
NOTE: The user data field may contain up to 8 pad octets.
9.2.9 Proprietary Header (P_HEAD) PDU
The P-HEAD PDU shall be used when a manufacturer wants to add its own header. The P-HEAD PDU has a length of
96 bits as shown in table 9.17.
Table 9.17: P-HEAD PDU content
Information element Length Remark
SAP Identifier 4
Format 4 Data packet identification
Manufacturer's Id (MFID) 8
Manufacturer's data 64 The syntax and semantics of these octets are proprietary
Header CRC 16 The CRC-CCITT shall be used as described in clause B.3.8
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9.2.10 Status/Precoded short data packet Header (SP_HEAD) PDU
The SP_HEAD PDU shall be used for Status/Precoded short data delivery as described in clause 8.2.1. The SP_HEAD
PDU has a length of 96 bits as shown in table 9.17A.
Table 9.17A: SP_HEAD PDU content
Information element Length Remark
Group or Individual 1 This bit is set to indicate that the destination LLID is for a group
Response Requested (A) 1
Appended Blocks 6 These bits shall be set to 0
Format 4 Data packet identification
SAP Identifier 4
Logical Link ID (LLID) 24 Destination
Logical Link ID (LLID) 24 Source
Source Port (SP) 3
Destination Port (DP) 3
Status/Precoded 10
Header CRC 16 The CRC-CCITT shall be used as described in clause B.3.8
9.2.11 Raw short data packet Header (R_HEAD) PDU
The R_HEAD PDU shall be used for Raw short data delivery as described in clause 8.2.1. The R_HEAD PDU has a
length of 96 bits as shown in table 9.17B.
Table 9.17B: R_HEAD PDU content
Information element Length Remark
Group or Individual 1 This bit is set to indicate that the destination LLID is for a group
Response Requested (A) 1
Appended Blocks 6
Format 4 Data packet identification
SAP Identifier 4
Logical Link ID (LLID) 24 Destination
Logical Link ID (LLID) 24 Source
Source Port (SP) 3
Destination Port (DP) 3
Selective Automatic Repeat
reQuest (SARQ)
1
Full Message Flag 1
Bit Padding 8
Header CRC 16 The CRC-CCITT shall be used as described in clause B.3.8
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9.2.12 Defined Data short data packet Header (DD_HEAD) PDU
The DD_HEAD PDU shall be used for Defined Data short data delivery as described in clause 8.2.1. The DD_HEAD
PDU has a length of 96 bits as shown in table 9.17C.
Table 9.17C: DD_HEAD PDU content
Information element Length Remark
Group or Individual 1 This bit is set to indicate that the destination LLID is for a group
Response Requested (A) 1
Appended Blocks 6
Format 4 Data packet identification
SAP Identifier 4
Logical Link ID (LLID) 24 Destination
Logical Link ID (LLID) 24 Source
Defined Data (DD) 6 Data Format
Selective Automatic Repeat
reQuest (SARQ)
1
Full Message Flag 1
Bit Padding 8
Header CRC 16 The CRC-CCITT shall be used as described in clause B.3.8
9.2.13 Unified Data Transport Header (UDT_HEAD) PDU
The UDT_HEAD PDU shall be used for UDT data delivery as described in clause 8.2.1. The UDT_HEAD PDU has a
length of 96 bits as shown in table 9.17D.
Table 9.17D: UDT-_HEAD PDU content
Information element Length Remark
Group or Individual 1 This bit is set to indicate that the destination LLID is for a group
Response Requested (A) 1 This bit shall be set to 0
Reserved 2 These bits shall be set to 0
Format 4 Data packet identification
SAP Identifier 4
UDT Format 4 UDT data format identification
Logical Link ID (LLID) 24 Destination
Logical Link ID (LLID) 24 Source
Pad Nibble 5
Reserved 1 This bit shall be set to 0
UAB 2
Supplementary Flag (SF) 1
Protect Flag (PF) 1
UDT Opcode (UDTO) 6 See TS 102 361-4 [11] for values
Header CRC 16 The CRC-CCITT shall be used as described in clause B.3.8
9.2.14 Unified Data Transport Last Data block (UDT_LDATA) PDU
The UDT_LDATA PDU is used as the last data block carrying user data for unconfirmed data delivery as described in
clause 8.2.2.1. The U_LDATA PDU has a length of 96 bits as shown in table 9.17E.
Table 9.17E: UDT_LDATA PDU content
Information element Length Remark
User Data 80 (see note)
Message CRC 16 The 16-bit CRC shall be used for the data message as described
in clause B.3.8
NOTE: The user data field may contain up to 10 pad octets.
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9.2.15 Rate 1 coded packet Data (R_1_DATA) PDU
The R_1_DATA PDU is used to carry user data for confirmed data delivery as described in clause 8.2.2.2. The
R_1_DATA PDU, when used for confirmed data, has a length of 192 bits as shown in table 9.18.
Table 9.18: R_1_DATA PDU content for confirmed data
Information element Length Remark
Data Block Serial Number (DBSN) 7
C-DATA CRC 9 The CRC-9 shall be used for DBSN and user data as described in
clause B.3.10
User Data 176 The user data field may contain pad octets
The R_1_DATA PDU is used to carry user data for unconfirmed data delivery as described in clause 8.2.2.1. This PDU,
when used for unconfirmed data, uses all 192 bits for user data as shown in table 9.18A.
Table 9.18A: R_1_DATA PDU content for unconfirmed data
Information element Length Remark
User Data 192 The user data field may contain pad octets
9.2.16 Rate 1 coded Last Data block (R_1_LDATA) PDU
The R_1_LDATA PDU is used as the last data block carrying user data for confirmed data delivery as described in
clause 8.2.2.2. The R_1_LDATA PDU, when used for confirmed data, has a length of 144 bits as shown in table 9.18B.
Table 9.18B: R_1_LDATA PDU content for confirmed data
Information element Length Remark
Data Block Serial Number (DBSN) 7
C-DATA CRC 9 The CRC-9 shall be used for DBSN and user data as described in
clause B.3.10
User Data 144 The user data field may contain up to 18 pad octets
Message CRC 32 The 32-bit CRC shall be used for the data message as described
in clause B.3.9
The R_1_LDATA PDU is used as the last data block carrying user data for unconfirmed data delivery as described in
clause 8.2.2.1. The R_1_LDATA PDU, when used for unconfirmed data, has a length of 160 bits as shown in
table 9.18C.
Table 9.18C: R_1_LDATA PDU content for unconfirmed data
Information element Length Remark
User Data 160 (see note)
Message CRC 32 The 32-bit CRC shall be used for the data message as described
in clause B.3.9
NOTE: The user data field may contain up to 20 pad octets.
9.3 Layer 2 information element coding
The following clauses contain descriptions of the information elements contained within layer 2 PDUs, and provide a
description of what the elements represent in relation to their bit representation. The structure of the tables is as follows:
• the information element column gives the name of the element;
• the element length column defines the length of the element in bits;
• the value column denotes fixed values or a range of values;
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the remarks column defines the meaning of the information element against each of its bit represented values.
9.3.1 Colour Code (CC)
The CC information element differentiates signalling that originates at another site as shown in table 9.18.
Table 9.18: Colour Code information element content
Information element Length Value Remark
0000
2
CC 0
etc. etc.
Colour Code 4
1111
2
CC 15
9.3.2 Privacy Indicator (PI)
The PI information element indicates if vocoder frames are using privacy mechanisms as described in table 9.19.
Table 9.19: Privacy Indicator information element content
Information element Length Value Remark
Privacy Indicator 1
0
2
Reserved for future use. PI is not defined in the
present document and shall be set to 0
2
9.3.3 LC Start/Stop (LCSS)
The LCSS information element is used for LC or CSBK signalling and indicates the start, continuation or end of a
signalling as described in table 9.20.
Table 9.20: LC Start/Stop information element content
Information element Length Value Remark
00
2
Single fragment LC or first fragment CSBK signalling,
see note
01
2
First fragment of LC signalling
10
2
Last fragment of LC or CSBK signalling
LC Start/Stop 2
11
2
Continuation fragment of LC or CSBK signalling
NOTE: There is no Single fragment LC defined for CACH signalling.
9.3.4 EMB parity
The EMB parity has a length of 9 bits. The Quadratic Residue (16,7,6) FEC shall be used as described in clause B.3.2.
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9.3.5 Feature set ID (FID)
The FID information element is used to identify one of several different "feature sets" as described in table 9.21.
Table 9.21: Feature set ID information element content
Information element Length Value Remark
00000000
2
Standardized feature set ID for the services and
facilities defined in TS 102 361-2 [5] (SFID)
00000001
2
Reserved for future standardization
00000010
2
Reserved for future standardization
00000011
2
Reserved for future standardization
00000100
2
Manufacturer's specific feature set ID (MFID)
etc. etc.
01111111
2
Manufacturer's specific feature set ID (MFID)
Feature set ID 8
1xxxxxxx
2
Reserved for future MFID's allocation (MFID)
NOTE: The FID redefines only Full LC and CSBK. It does not redefine the EMB PDU.
9.3.6 Data Type
The Data Type information element indicates the type of data or control that is being carried in a general data burst as
described in table 9.22.
Table 9.22: Data Type information element content
Information element Length Value Remark
0000
2
PI Header
0001
2
Voice LC Header
0010
2
Terminator with LC
0011
2
CSBK
0100
2
MBC Header
0101
2
MBC Continuation
0110
2
Data Header
0111
2
Rate ½ Data
1000
2
Rate ¾ Data
1001
2
Idle
1010
2
Rate 1 Data
1011
2
Reserved for future use
1100
2
Reserved for future use
1101
2
Reserved for future use
1110
2
Reserved for future use
Data Type 4
1111
2
Reserved for future use
9.3.7 Slot Type parity
The Slot Type parity information element has a length of 12 bits. The Golay (20,8) FEC shall be used as described in
clause B.3.1.
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9.3.8 Access Type (AT)
The AT information element indicates whether the next inbound slot is busy or idle as described in table 9.23.
Table 9.23: Access Type information element content
Information element Length Value Remark
0
2
Inbound channel is idle
Access Type 1
1
2
Inbound channel is busy
9.3.9 TDMA Channel (TC)
The TC information element indicates whether the next inbound and outbound burst is channel 1 or channel 2 as
described in table 9.24.
Table 9.24: TDMA Channel information element content
Information element Length Value Remark
0
2
Following outbound burst is channel 1
TDMA Channel 1
1
2
Following outbound burst is channel 2
9.3.10 Protect Flag (PF)
The Protect Flag is described in table 9.25.
Table 9.25: Protect Flag information element content
Information element Length Value Remark
Protect Flag (PF) 1
0
2
Reserved for future use. PF is not defined in the
present document and shall be set to 0
2
9.3.11 Full Link Control Opcode (FLCO)
The FLCO information element is used to identify an "over-air" facility within" a "facility set" identified by the FID as
described in table 9.26.
Table 9.26: Full Link Control Opcode information element content
Information element Length Value Remark
Full Link Control Opcode 6 any Details of the FLCO element coding is defined in
TS 102 361-2 [5] and TS 102 361-3 [12]
9.3.12 Short Link Control Opcode (SLCO)
The SLCO information element is used to identify the short LC message type as described in table 9.27.
Table 9.27: Short Link Control Opcode information element content
Information element Length Value Remark
Short Link Control Opcode 4 any Details of the SLCO element coding is defined in
TS 102 361-2 [5]
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9.3.13 TACT parity
The TACT parity information element has a length of 3 bits. The Hamming (7,4) FEC shall be used as described in
clause B.3.5.
9.3.14 RC parity
The RC parity information element has a length of 21 bits. The variable BPTC FEC shall be used as described in
clause B.2.2.
9.3.15 Group or Individual (G/I)
The G/I information element is used to indicate the confirmation of a data message as described in table 9.28.
Table 9.28: Group or Individual information element content
Information element Length Value Remark
0
2
The destination LLID is for an individual MS
Group or Individual 1
1
2
The destination LLID is for a group of MSs
9.3.16 Response Requested (A)
The A information element is used to indicate the confirmation of a data message as described in table 9.29.
Table 9.29: Response Requested information element content
Information element Length Value Remark
0
2
No Response
Response Requested 1
1
2
Response Required
9.3.17 Data Packet Format (DPF)
The DPF information element is used for data packet identification as described in table 9.30.
Table 9.30: Data packet format information element content
Information element Length Value Remark
0000
2
Unified Data Transport (UDT)
0001
2
Response packet
0010
2
Data packet with unconfirmed delivery
0011
2
Data packet with confirmed delivery
1101
2
Short Data: Defined
1110
2
Short Data: Raw or Status/Precoded
1111
2
Proprietary Data Packet
Data packet Format 4
others Reserved
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9.3.17A Header Compression (HC)
The HC information element is used to indicate the TCP/IP or UDP/IP header compression as described in table 9.30A.
Table 9.30A: Header Compression information element content
Information element Length Value Remark
0
2
Full TCP/IP or UDP/IP header is used
Header Compression 1
1
2
Compressed TCP/IP or UDP/IP header is used
9.3.18 SAP identifier (SAP)
The SAPID information element in a header is used to identify the type of processing required for the following
block(s). It is described in table 9.31.
Table 9.31: Service Access Point ID information element content
Information element Length Value Remark
0000
2
Unified Data Transport (UDT)
0010
2
TCP/IP header compression
0011
2
UDP/IP header compression
0100
2
IP based Packet data
0101
2
Address Resolution Protocol (ARP)
1001
2
Proprietary Packet data
1010
2
Short Data
Service Access Point ID 4
others Reserved
9.3.19 Logical Link ID (LLID)
The LLID information element identifies either the source address (i.e. the MS unit) which sent the packet or the
destination address (i.e. the MS unit or group of MS units) to which the packet is directed depending on the I/O
information element as described in table 9.32.
Table 9.32: Logical Link ID information element content
Information element Length Value Remark
Logical Link ID 24 any Details of the LLID element coding is defined in
TS 102 361-2 [5]
9.3.20 Full message flag (F)
The F information element is used in the receiver to signify that the Pad Octet Count information element indicates the
amount of data being transported in the complete packet as described in table 9.33.
Table 9.33: Full Message Flag information element content
Information element Length Value Remark
1
2
First try for the complete packet
Full Message Flag 1
0
2
Subsequent tries
9.3.21 Blocks to Follow (BF)
The BF information element specifies the number of blocks in the packet not including the first header block as
described in table 9.34.
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Table 9.34: Blocks to Follow information element content
Information element Length Value Remark
Blocks to Follow 7 any Number of blocks to follow
9.3.22 Pad Octet Count (POC)
The POC information element specifies the number of pad octets which have been appended to the user data octets to
form an integer number of blocks as described in table 9.35.
The actual number of data octets is:
a) for rate ¾ confirmed data type: 16 × (BF - no. of additional headers) - 4 - POC;
b) for rate ½ confirmed data type: 10 × (BF - no. of additional headers) - 4 - POC;
c) for rate 1 confirmed data type: 22 × (BF - no. of additional headers) - 4 - POC;
d) for rate ¾ unconfirmed data type: 18 × (BF - no. of additional headers) - 4 - POC;
e) for rate ½ unconfirmed data type: 12 × (BF - no. of additional headers) - 4 - POC;
f) for rate 1 unconfirmed data type: 24 × (BF - no. of additional headers) - 4 - POC.
Table 9.35: Pad Octet Count information element content
Information element Length Value Remark
Pad Octet Count 5 any Number of pad octets appended to the user data
9.3.23 Re-Synchronize Flag (S)
The S information element is used to re-synchronize the physical sub-layer sequence numbers as described in
table 9.36.
The receiver accepts the N(S) and FSN information elements in the message if the S bit is asserted. This bit effectively
disables the rejection of duplicate messages when it is asserted. It should only be asserted on specially defined
registration messages. On all user data messages, it should be cleared.
Table 9.36: Re-Synchronize Flag information element content
Information element Length Value Remark
0
2
The receiver should not sync its sequence numbers with those in the
header
Re-Synchronize Flag 1
1
2
The receiver should sync its sequence numbers with those in the
header
9.3.24 Send sequence number (N(S))
The N(S) information element specifies the send sequence number of the packet as described in table 9.37.
This is used to identify each request packet so that the receiver may correctly order the received message segments and
eliminate duplicate copies. The sequence number starts with 0 and is incremented modulo 8 for each new data packet
that is transmitted. The transmitter shall not increment this counter for an automatic retry. The receiver maintains a
receiver variable VI which is the sequence number of the last valid packet to be received. The receiver accepts packets
with:
a) N(S) = VI or VI + 1; if
b) N(S) = VI, then the packet is a duplicate; if
c) N(S) = VI + 1, then the packet is the next one in the sequence.
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Table 9.37: Send sequence number information element content
Information element Length Value Remark
Send sequence number 3 any The Packet Sequence Number of a sender. It is used
for confirmed delivery of a packet
9.3.25 Fragment Sequence Number (FSN)
The FSN information element is used to consecutively number confirmed data message fragments that together make
up a longer confirmed data message as described in table 9.38. It is also transmitted in single fragment unconfirmed and
confirmed data messages and is also defined in table 9.38.
The most significant FSN bit for multi-fragment confirmed data messages shall be asserted for the last fragment in the
chain, and shall be cleared otherwise. The three least significant bits correspond to the Fragment Sequence Number.
They shall be set to 000
2
for the first fragment and shall be incremented for each subsequent message. When the
number reaches 111
2
the next increment shall be 001
2
and not 000
2
. A logical message consisting of a single physical
confirmed data message (or packet) shall have a value of 1000
2
for the FSN. The example shows FSN of a datagram
having 14 fragments.
EXAMPLE: FSN coding.
Fragment 1 2 3 4 5 6 7 8 9 10 11 12 13 14
FSN
0000
2
0001
2
0010
2
0011
2
0100
2
0101
2
0110
2
0111
2
0001
2
0010
2
0011
2
0100
2
0101
2
1110
2
Table 9 .38: Fragment sequence number information element content
Information element Length Value Remark
0xxx
2
Subsequent confirmed data fragment with
number xxx
2
1xxx
2
Last confirmed data fragment with number
xxx
2
1000
2
Confirmed data single fragment
Fragment sequence number 4
0000
2
Unconfirmed data single fragment
9.3.26 Data Block Serial Number (DBSN)
The DBSN information element is used to identify the serial number for the data block within the packet as described in
table 9.39.
On the first try these serial numbers start at 0 and increment up to M-1, where M is equal to the Blocks to Follow
information element in the Header Block. On subsequent retries, not all blocks are generally included, and these serial
numbers allow the transmitter to indicate which blocks are being sent.
Table 9.39: Data Block Serial Number information element content
Information element Length Value Remark
Data Block Serial Number 7 any
9.3.27 Data block CRC (CRC-9)
The Data block CRC information element has a length of 9 bits. The CRC-9 shall be used to protect the user data and
DBSN information element as described in clause B.3.10.
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9.3.28 Class (Class)
The Class information element is described in table 9.40. It is used together with Type and Status information elements
to specify the meaning of the response, see table 8.2.
Table 9.40: Class information element content
Information element Length Value Remark
Class 2 any (see note)
NOTE: The definition will be made in TS 102 361-3 [12].
9.3.29 Type (Type)
The Type information element is described in table 9.41. It is used together with Class and Status information elements
to specify the meaning of the response, see table 8.2.
Table 9.41: Type information element content
Information element Length Value Remark
Type 3 any (see note)
NOTE: The definition will be made in TS 102 361-3 [12].
9.3.30 Status (Status)
The Status information element is described in table 9.42. It is used together with Class and Type information elements
to specify the meaning of the response, see table 8.2.
Table 9.42: Status information element content
Information element Length Value Remark
Status 3 any (see note)
NOTE: The definition will be made in TS 102 361-3 [12].
9.3.31 Last Block (LB)
The LB information element indicates whether more blocks in a MBC are to follow, if this is the last block in an MBC
or if this is the only block in a CSBK as described in table 9.43.
Table 9.43: Last Block information element content
Information element Length Value Remark
0
2
MBC Header or Continuation Block
Last_Block 1
1
2
CSBK or MBC Last Block
9.3.32 Control Signalling BlocK Opcode (CSBKO)
The CSBKO information element is used to identify an "over-air" facility within a "facility set" identified by the FID as
described in table 9.44.
Table 9.44: Control Signalling BlocK Opcode information element content
Information element Length Value Remark
Control Signalling Block Opcode 6 any Details of the CSBKO element coding is defined in
TS 102 361-2 [5]
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9.3.33 Appended Blocks (AB)
The AB information element specifies the number of appended blocks in the packet not including the first header block
as described in table 9.45.
Table 9.45: Appended Blocks information element content
Information element Length Value Remark
Appended Blocks 6 any Number of appended blocks to follow
9.3.34 Source Port (SP)
The SP information element specifies the number of the source port described in table 9.46.
Table 9.46: Source Port information element content
Information element Length Value Remark
Source Port 3 any Source port number
9.3.35 Destination Port (DP)
The DP information element specifies the number of the destination port described in table 9.47.
Table 9.47: Destination Port information element content
Information element Length Value Remark
Destination Port 3 any Destination port number
9.3.36 Status/Precoded (S_P)
The S_P information element specifies the status/precoded message content as described in table 9.48.
Table 9.48: Source Port information element content
Information element Length Value Remark
Status/Precoded 10 any Message content
9.3.37 Selective Automatic Repeat reQuest (SARQ)
The SARQ information element specifies if the source requires SARQ as described in table 9.49.
Table 9.49: SARQ information element content
Information element Length Value Remark
0
2
Source does not require SARQ
Selective Automatic Repeat
reQuest
1
1
2
Source does require SARQ
9.3.38 Defined Data format (DD)
The DD information element specifies data format as described in table 9.50.
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Table 9.50: DD information element content
Information element Length Value Remark
000000
2
Binary
000001
2
BCD
000010
2
7 bit character
000011
2
8 bit ISO 8859-1 [10]
000100
2
8 bit ISO 8859-2 [10]
000101
2
8 bit ISO 8859-3 [10]
000110
2
8 bit ISO 8859-4 [10]
000111
2
8 bit ISO 8859-5 [10]
001000
2
8 bit ISO 8859-6 [10]
001001
2
8 bit ISO 8859-7 [10]
001010
2
8 bit ISO 8859-8 [10]
001011
2
8 bit ISO 8859-9 [10]
001100
2
8 bit ISO 8859-10 [10]
001101
2
8 bit ISO 8859-11 [10]
001110
2
8 bit ISO 8859-13 [10]
001111
2
8 bit ISO 8859-14 [10]
010000
2
8 bit ISO 8859-15 [10]
010001
2
8 bit ISO 8859-16 [10]
010010
2
Unicode UTF-8
010011
2
Unicode UTF-16
010100
2
Unicode UTF-16BE
010101
2
Unicode UTF-16LE
010110
2
Unicode UTF-32
010111
2
Unicode UTF-32BE
011000
2
Unicode UTF-32LE
Defined Data format (DD) 6
others Reserved
9.3.39 Unified Data Transport Format (UDT Format)
The UDT Format information element specifies data format as described in table 9.51.
Table 9.51: UDT Format information element content
Information element Length Value Remark
0000
2
Binary
0001
2
MS Address
0010
2
4 bit BCD
0011
2
ISO 7-bit coded characters [9]
0100
2
ISO 8-bit coded characters [10]
0101
2
NMEA location coded [8]
0110
2
IP address
0111
2
16 bit Unicode characters
1000
2
Custom Coded (manufacturer specific)
1001
2
Custom Coded (manufacturer specific)
Unified Data Transport Format
(UDT Format)
4
others Reserved for future use
9.3.40 UDT Appended Blocks (UAB)
The UAB information element specifies the number of appended blocks in the UDT packet not including the header
block as described in table 9.52.
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Table 9.52: Blocks to Follow information element content
Information element Length Value Remark
UDT Appended Blocks 2 any Number of UDT appended blocks to follow
9.3.41 Supplementary Flag (SF)
The SF information element specifies the type of appended blocks in the UDT packet as described in table 9.53.
Table 9.53: Blocks to Follow information element content
Information element Length Value Remark
0
2
Short Data
Supplementary Flag 1
1
2
Supplementary Data
9.3.42 Pad Nibble
The Pad Nibble information element specifies the number of pad nibbles (4 bits) that have been appended to the user
data as described in table 9.54.
Table 9 .54: Pad Nibble information element content
Information element Length Value Remark
Pad Nibble 5 any Number of pad nibbles appended to the user data
10 Physical Layer
10.1 General parameters
The DMR equipment shall comply with the essential requirements as stated in EN 300 113-2 [2] or EN 300 390-2 [4].
10.1.1 Frequency range
The radio system operates in part of the RF frequency range of 30 MHz to 1 GHz.
10.1.2 RF carrier bandwidth
The radio system operates within a 12,5 kHz RF carrier bandwidth.
10.1.3 Transmit frequency error
The maximum BS transmit frequency error from the assigned RF carrier centre shall be as defined in table 10.1.
Table 10.1: BS transmit frequency error
Frequency range BS maximum frequency error
50 MHz to 300 MHz ±2 ppm
300 MHz to 600 MHz ±1 ppm
600 MHz to 800 MHz ±0,75 ppm
800 MHz to 1 GHz ±0,3 ppm
The maximum MS transmit frequency error from the assigned RF carrier centre shall be as defined in table 10.2.
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Table 10.2: MS transmit frequency error
Frequency range MS maximum frequency error
50 MHz to 600 MHz ±2 ppm
600 MHz to 1 GHz ±1,5 ppm
The method of measurement is defined in EN 300 113-1 [1] or EN 300 390-1 [3].
NOTE: In the 600 MHz to 1 GHz range, it is recommended that the MS is frequency locked to the BS to improve
system performance.
10.1.4 Time base clock drift error
The maximum time base clock drift error shall be ±2 ppm. This error is the amount of clock drift that is acceptable
during a MS transmission. Before transmission, the MS synchronizes in time with the BS. During transmission, this MS
is allowed to deviate in time by the maximum time base clock drift error.
NOTE: This parameter limits operating distance and transmission time in 2:1-mode TDMA operation modes as
defined in clause 10.2.4.1.3.
10.2 Modulation
10.2.1 Symbols
The modulation sends 4 800 symbols/s with each symbol conveying 2 bits of information.
The maximum deviation,
D
, of the symbol is defined as:
ThD 2/3=
(1)
where:
-
h
is the deviation index defined for the particular modulation; and
-
T
is the symbol time (1 / 4 800) in s.
10.2.2 4FSK generation
This clause describes the characteristics of the constant-envelope modulation, entitled 4FSK.
10.2.2.1 Deviation index
The deviation index, h , for 4FSK is defined to be 0,27. This yields a symbol deviation of 1,944 kHz at the symbol
centre. The mapping between symbols and bits is given in table 10.3.
Table 10.3: Dibit symbol mapping to 4FSK deviation
Information bits
Bit 1 Bit 0
Symbol 4FSK deviation
0 1 +3 +1,944 kHz
0 0 +1 +0,648 kHz
1 0 -1 -0,648 kHz
1 1 -3 -1,944 kHz
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10.2.2.2 Square root raised cosine filter
A Square Root Raised Cosine Filter is implemented for 4FSK so that part of a Nyquist Raised Cosine is used for the
transmit splatter filter and part is used by the receiver to reject noise. The input to the transmit splatter filter consists of a
series of impulses, scaled according to clause 10.2.3.1, and separated in time by 208,33 microseconds (1 / 4 800 s). The
method of splitting the Nyquist Raised Cosine Filter is to define the splatter filter frequency response of the Square
Root Raised Cosine Filter as the square root of the Nyquist Raised Cosine Filter. The group delay of the filter is flat
over the pass band for |f| < 2 880 Hz. The magnitude response of the filter is given approximately by the following
formula:
1)( =fF
for
Hzf 9201≤
⎟
⎠
⎞
⎜
⎝
⎛
=
9201
cos)(
f
fF
π
for
HzfHz 88029201 ≤<
0)( =fF for
Hzf 8802>
(2)
where
)( fF = magnitude response of the Square Root Raised Cosine Filter.
NOTE: f = frequency in hertz.
10.2.2.3 4FSK Modulator
The 4FSK modulator consists of a Square Root Raised Cosine Filter, cascaded with a frequency modulator as shown in
figure 10.1. The Square Root Raised Cosine Filter is described in clause 10.2.3.2.
Frequency
Modulator
Frequency
Modulator
F(f)
Filter
Dibits
Input
4FSK
Output
Figure 10.1: 4FSK modulator
The 4FSK modulator must have the deviation set to provide the proper carrier phase shift for each modulated symbol.
The deviation is set with a test signal consisting of the following symbol stream:
...+3 +3 -3 -3 +3 +3 -3 -3…
This test signal is processed by the modulator to create a 4FSK signal equivalent to a 1,2 kHz sine wave modulating an
FM signal with a peak deviation equal to:
2
× 1 944 Hz = 2 749 Hz.
The method of measurement employs an FM demodulator to measure both the peak positive and peak negative
deviation. The audio bandwidth of the FM demodulator is set with a high pass filter corner frequency
≤
15 Hz and a low
pass filter corner frequency
≥
3 kHz.
NOTE: The de-emphasis function is disabled on the FM demodulator.
The peak positive and peak negative deviation specification limits are 2 749 Hz
±
10 %, or 2 474 Hz to 3 024 Hz.
10.2.3 Burst timing
The transmissions in a TDMA system consist of short bursts at regular intervals. The timing of these bursts is critical to
the performance of a TDMA system. There are two types of bursts defined for the protocol:
•
Normal Bursts; and
•
RC Bursts.
Both utilize the TDMA frame and slot structure show in figure 10.2. For some timing examples see also annex C.
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60 ms
30 ms 30 ms
15 ms 15 ms 15 ms 15 ms
Slot 1 Slot 2
time
Slot 1 Center
Slot 2 Center
Figure 10.2: TDMA frame
Each TDMA frame is 60 ms long and consists of two 30 ms slots. Generally, one call will use Slot 1 and a different call
will use Slot 2. Calls consist of a series of slots equal to the duration of the call. For systems using a BS the mobile
station synchronizes to the base station. The information carried in the slot is centred on the slot centre.
10.2.3.1 Normal burst
The Normal Burst shall be used for voice, data and control applications. It provides 264 bits of data per burst, which is a
data rate of 4,4 kbit/s. This is the burst used for most applications.
10.2.3.1.1 Power ramp time
The instantaneous transmitter power levels shall be constrained to the mask given in figure 10.3. The mask assures that
near-far situations will not result in co-channel inter-slot interference on the alternate or non-transmission slot. The
mask also assures that the power level will be adequate for acceptable BER performance.
+1 dBp
+4 dBp
-
3 dBp
-
57 dBm
1,5 ms
13,
75 ms
1,
5 ms
Region A
Region C
Region B
Slot Center
13,
75 ms
27,
5 ms
Figure 10.3: Power waveform mask for normal burst
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The power levels given in the mask during the 27,5 ms symbol transmission period are given in dBp, where 0 dBp is
defined as:
∫
−
≡
75,13
75,13
)(
5,27
1
0 dttTxPdB
p
(3)
where:
•
)(tTxP is the instantaneous transmitter power; and
• the timing is relative to the slot centre.
Thus, 0 dBp is the average power during the 27,5 ms symbol transmission period, (Region B in figure 10.3). The
average power over the symbol transmission period (0 dBp level) shall use the Carrier Power method of measurement
and the tolerance to deviation levels as defined in EN 300 113-1 [1] or EN 300 390-1 [3].
10.2.3.1.2 Symbol timing
Figure 10.4 depicts the Normal Burst's timing of the four-level symbols within a 30 ms slot. The normal burst contains
132 symbols with 66 symbols on each side of the slot centre. The centre of the first symbol transmitted is 65½ symbol
times from the slot centre.
Slot Centre
Symbol
2
Symbol
1
Symbol
3
Symbol
65
Symbol
66
Symbol
67
Symbol
68
Symbol
131
Symbol
130
Symbol
132
27,5 ms
13,645833 ms
+3
+1
-1
-3
Symbol
13,645833 ms
Slot Centre
Symbol
2
Symbol
1
Symbol
3
Symbol
65
Symbol
66
Symbol
67
Symbol
68
Symbol
131
Symbol
130
Symbol
132
27,5 ms
13,645833 ms
+3
+1
-1
-3
Symbol
13,645833 ms
Figure 10.4: Normal burst symbol timing within a slot
10.2.3.1.3 Propagation delay and transmission time
A 1 ms propagation delay allowance is built in to the Normal Burst structure for propagation delay and time base clock
drift. This allowance protects against inter-slot interference at the base station receiver. The MS shall time synchronize
with the BS before transmitting. Actual time synchronization at beginning of transmission will deviate from 0 ms by the
propagation delay. As MS transmits, the time base clock drift error may cause further time deviation from "true" time
synchronization.
This 1 ms allowance theoretically enables a mobile to operate up to 150 km from the BS without inter-slot interference.
However, as the MS transmits it may deviate from true synchronization and cause inter-slot interference. Therefore a
system trade off is necessary to account for both propagation delay and clock drift deviations. This trade off is between
the maximum MS operating distance from the site and maximum transmission time of the MS. The following example
details how this trade off is calculated.
The amount of time allocated to propagation delay is determined by the intended maximum coverage distance.
Maximum round trip propagation time is defined by:
Maximum Round Trip Propagation Time = 2 × (Maximum Distance/c)
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where:
• c is the speed of light.
NOTE 1: The factor of two is included for round trip propagation delay.
For a 75 km maximum distance between the base station and a mobile station, 0,5 ms of the 1 ms allowance is
dedicated to propagation delay. This leaves 0,5 ms for time base clock drift during transmission. The maximum time
base clock drift error as specified in clause 10.1.4 is
±
2 ppm and worse case occurs when one MS clock drifts fast and
one MS clock drifts slow. Under this situation, the MS maximum transmission time is defined by:
Maximum Transmission Time = 0,5 × ((Clock Drift Error Allowance) / (Drift per Symbol)) × Symbol Time
where:
• clock drift error allowance is 1 ms - Maximum Round Trip Propagation Time; and
• Drift per Symbol = 0,4167 ns for 2 ppm clock stability.
NOTE 2: The factor 0,5 is included to take into account drift from two independent MS drifting in opposite
directions in time.
For the case where Clock Drift Error Allowance = 0,5 ms, the Maximum Transmission Time is 125 s.
10.2.3.2 Reverse channel (RC) burst
The RC burst is a short burst that may be used to provide a low data rate channel to a transmitting mobile.
10.2.3.2.1 Power ramp time
The instantaneous transmitter power levels shall be constrained to the mask given in figure 10.5. The mask assures that
the power level will be adequate for acceptable BER performance over this very short burst. Inter-slot interference is
not an issue here since the burst is so much shorter than the slot time. Since the power level is more tightly constrained
than in the Normal Burst, additional ramp time is allocated. Again, 0 dBp is determined by averaging the instantaneous
power over Region B of the mask.
+1 dBp
+4 dBp
-
1 dBp
-
57 dBm
2,5 ms
5 ms
2,5 ms
Region A
Region C
Region B
Slot Center
5 ms
10 ms
Figure 10.5: Power waveform mask for standalone Reverse Channel (RC) burst
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The power levels given in the mask are given during the 10 ms symbol transmission period in dBp, where 0 dBp is
defined as:
∫
−
≡
0,5
0,5
)(
0,10
1
0 dttTxPdB
p
(4)
where:
• )(tTxP is the instantaneous transmitter power; and
• the timing is relative to slot centre.
Thus, 0 dBp is the average power during the 10 ms symbol transmission period, (Region B in figure 10.5). The average
power over the symbol transmission period (0 dBp level) shall use the Carrier Power method of measurement and the
tolerance to deviation levels as defined in EN 300 113-1 [1] or EN 300 390-1 [3].
10.2.3.2.2 Symbol timing
Figure 10.6 depicts the RC Burst's timing of the four-level symbols within a 30 ms slot. The normal burst contains 48
symbols with 24 symbols on each side of the slot centre. The centre of the first symbol transmitted is 23,5 symbol times
from the slot centre.
Slot Centre
Symbol
2
Symbol
1
Symbol
3
Symbol
23
Symbol
24
Symbol
25
Symbol
26
Symbol
47
Symbol
46
Symbol
48
10 ms
4,895833 ms 4,895833 ms
+3
Symbol
+1
-1
-3
Slot Centre
Symbol
2
Symbol
1
Symbol
3
Symbol
23
Symbol
24
Symbol
25
Symbol
26
Symbol
47
Symbol
46
Symbol
48
10 ms
4,895833 ms 4,895833 ms
+3
Symbol
+1
-1
-3
Figure 10.6: Reverse Channel (RC) burst symbol timing within a slot
10.2.3.2.3 Propagation delay
Because the RC Burst is so short, there is no danger of inter-slot interference as there is with the Normal Burst. Still,
propagation delay must be considered because it affects where the receiver needs to look to find the RC burst. A 1 ms
propagation allowance is specified to limit the amount of time the receiver has to spend looking for the RC.
10.2.3.3 Synthesizer Lock-Time constraints
There are different synthesizer lock-time scenarios depending on the type of bursts being sent and received. The
synthesizer lock-time specification will be determined by the most restrictive case for which the radio is designed.
Direct mode only radios supporting RC signalling shall require a synthesizer lock-time of 11,25 ms. BS mode radios
supporting RC signalling shall require a synthesizer lock time of 6,25 ms. In all cases, lock time is defined to be the
time required to lock within 100 Hz of the average frequency over the symbol transmission time as defined in
clause 10.1.3.
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10.2.3.4 Transient frequency constraints during symbol transmission time
To ensure adequate BER performance during the 27,5 ms symbol transmission time, the maximum unmodulated
frequency deviation shall be ±100 Hz from the average frequency over the symbol transmission time. The average
frequency over the symbol transmission time is defined in clause 10.1.3.
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Annex A (normative):
Numbering and addressing
All Full Link Control messages shall be used to convey a Source Identifier (ID) which shall identify the individual
address of the transmitting entity and a Destination ID which shall identify the address of the receiving entity (or
entities). The Source and Destination IDs shall always be 24 bits in length. The DMR addressing scheme is shown in
table A.1.
Table A.1: DMR addressing scheme
DMR ID Name Number of
addresses
Remark
Talkgroup addressing
000000
16
Null 1 Null, see note
000001
16
- FFFCDF
16
Talkgroup ID > 16M MS talkgroup addresses
FFFCE0
16
- FFFFDF
16
Reserved 768 Reserved for future expansion
FFFFE0
16
- FFFFEF
16
Unaddressed Idn
(n=0-15)
16 Special unaddressed talkgroup IDs
FFFFF0
16
- FFFFFF
16
All talkgroup Idn
(n=0-15)
16 Special talkgroups containing all MSs
Individual addressing
000000
16
Null 1 Null, see note
000001
16
- FFFCDF
16
Unit ID > 16M MS individual addresses
FFFCE0
16
- FFFEDF
16
Reserved 512 Reserved for future expansion
FFFEE0
16
- FFFEEF
16
System gateway Idn
(n=0-15)
16 Gateways to system (e.g. repeater) and
system interfaced devices not
addressable via the DMR ID
(e.g. PABX, PSTN, SMS router)
FFFEF0
16
- FFFFEF
16
Custom 256 Available for customization
FFFFF0
16
- FFFFFF
16
All unit Idn (n=0-15) 16 Special IDs used to address all MSs
NOTE: This is not a valid source or destination address.
Systems which do not use the partitioned address scheme for "All talkgroup Idn" or "All unit Idn" shall use FFFFFF
16
to address everybody on the system. In systems with partitioned address schemes, FFFFF0
16
to FFFFFF
16
are used to
address everybody in each of the respective partitions. Only one scheme shall exist in a particular system.
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Annex B (normative):
FEC and CRC codes
Table B.1 summarizes the FEC codes and CRC codes which shall be used in the protocol.
Table B.1: FEC and CRC summary
Field FEC code Checksum
EMB field Quadratic Residue (16,7,6) none
Slot Type Golay (20,8) none
CACH TACT bits Hamming (7,4) none
Embedded signalling Variable length BPTC 5-bit CheckSum (CS)
Reverse Channel (RC) Signalling Variable length BPTC defined as part of RC message
Short LC in CACH Variable length BPTC 8-bit CRC
PI Header BPTC(196,96) CRC-CCITT
Voice LC header BPTC(196,96) (12,9) Reed-Solomon
Terminator with LC BPTC(196,96) (12,9) Reed-Solomon
CSBK BPTC(196,96) CRC-CCITT
Idle message BPTC(196,96) none
Data header BPTC(196,96) CRC-CCITT
Unconfirmed: none Rate ½ data continuation BPTC(196,96)
Confirmed: CRC-9
Unconfirmed: 32-bit CRC Rate ½ last data block BPTC(196,96)
Confirmed: 32-bit CRC and CRC-9
Unconfirmed: none Rate ¾ data continuation Rate ¾ Trellis
Confirmed: CRC-9
Unconfirmed: 32-bit CRC Rate ¾ last data block Rate ¾ Trellis
Confirmed: 32-bit CRC and CRC-9
Unconfirmed: none Rate 1 non-last data block Rate 1 coded
Confirmed: CRC-9
Unconfirmed: 32-bit CRC Rate 1 last data block Rate 1 coded
Confirmed: 32-bit CRC and CRC-9
Response header block BPTC(196,96) CRC-CCITT
Response data block BPTC(196,96) 32-bit CRC
MBC header BPTC(196,96) CRC-CCITT
MBC continuation BPTC(196,96) none
MBC last block BPTC(196,96) CRC-CCITT
UDT header BPTC(196,96) CRC-CCITT
UDT continuation BPTC(196,96) none
UDT last block BPTC(196,96) CRC-CCITT
The following abbreviations are used in the figures and tables:
AT Access Type bit
CR CRC bits
CS Checksum bit for embedded Full LC
Enc_Dibit Output Dibit from Trellis Encoder
H Hamming parity bits
H_Cx Hamming parity bit from column x of a BPTC
H_Rx Hamming parity bit from row x of a BPTC
Hx Hamming parity bit for row X of a BPTC
I Information bit
LC Link Control information bit
LCSS Link Control Start/Stop
P CACH payload
PC Parity Check bit
R Reserved bit
RC Reverse Channel information bit
TC TDMA Channel bit
Trellis_Dibit Output Dibit from Trellis Code
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TX Transmitted bit
B.1 Block Product Turbo Codes
B.1.1 BPTC (196,96)
Control signalling, Unconfirmed and Confirmed data is protected using a (196,96) Block Product Turbo Code
illustrated in figure B.1. The 96 bits of information, I(0) - I(95) are placed in a 9 row × 11 column matrix as shown.
Three reserved bits, R(0) - R(2), are set to zero and added to round out the payload to 99 bits. Each row is protected
using a Hamming (15,11,3) code as indicated with the H_Rx bits. Each column is protected using a Hamming (13,9,3)
code as indicated with the H_Cx bits.
R(0) I(95) I(94) I(93) I(92) I(91) I(90) I(89) I(88) H_R1(3) H_R1(2) H_R1(1) H_R1(0)
I(85) I(84) I(83) I(82) I(81) I(80) I(79) I(78) I(77) H_R2(3) H_R2(2) H_R2(1) H_R2(0)
I(74) I(73) I(72) I(71) I(70) I(69) I(68) I(67) I(66) H_R3(3) H_R3(2) H_R3(1) H_R3(0)
I(63) I(62) I(61) I(60) I(59) I(58) I(57) I(56) I(55) H_R4(3) H_R4(2) H_R4(1) H_R4(0)
I(52) I(51) I(50) I(49) I(48) I(47) I(46) I(45) I(44) H_R5(3) H_R5(2) H_R5(1) H_R5(0)
I(41) I(40) I(39) I(38) I(37) I(36) I(35) I(34) I(33) H_R6(3) H_R6(2) H_R6(1) H_R6(0)
I(30) I(29) I(28) I(27) I(26) I(25) I(24) I(23) I(22) H_R7(3) H_R7(2) H_R7(1) H_R7(0)
I(19) I(18) I(17) I(16) I(15) I(14) I(13) I(12) I(11) H_R8(3) H_R8(2) H_R8(1) H_R8(0)
I(8) I(7) I(6) I(5) I(4) I(3) I(2) I(1) I(0) H_R9(3) H_R9(2) H_R9(1) H_R9(0)
H_C3(3) H_C4(3) H_C5(3) H_C6(3) H_C7(3) H_C8(3) H_C9(3) H_C10(3) H_C11(3) H_C12(3) H_C13(3) H_C14(3) H_C15(3)
H_C3(2) H_C4(2) H_C5(2) H_C6(2) H_C7(2) H_C8(2) H_C9(2) H_C10(2) H_C11(2) H_C12(2) H_C13(2) H_C14(2) H_C15(2)
H_C3(1) H_C4(1) H_C5(1) H_C6(1) H_C7(1) H_C8(1) H_C9(1) H_C10(1) H_C11(1) H_C12(1) H_C13(1) H_C14(1) H_C15(1)
H_C3(0) H_C4(0) H_C5(0) H_C6(0) H_C7(0) H_C8(0) H_C9(0) H_C10(0) H_C11(0) H_C12(0) H_C13(0) H_C14(0) H_C15(0)
R(2)
I(87)
I(76)
I(65)
I(54)
I(43)
I(32)
I(21)
I(10)
H_C1(3)
H_C1(2)
H_C1(1)
H_C1(0)
R(1)
I(86)
I(75)
I(64)
I(53)
I(42)
I(31)
I(20)
I(9)
H_C2(3)
H_C2(2)
H_C2(1)
H_C2(0)
I(95) I(94) I(93) I(92) I(91) I(90) I(89) I(88)
I(7) I(6) I(5) I(4) I(3) I(2) I(1) I(0)
I_0
I_11
I(87) I(86) I(85) I(84) I(83) I(82) I(81) I(80)
I_1
R(0) I(95) I(94) I(93) I(92) I(91) I(90) I(89) I(88) H_R1(3) H_R1(2) H_R1(1) H_R1(0)
I(85) I(84) I(83) I(82) I(81) I(80) I(79) I(78) I(77) H_R2(3) H_R2(2) H_R2(1) H_R2(0)
I(74) I(73) I(72) I(71) I(70) I(69) I(68) I(67) I(66) H_R3(3) H_R3(2) H_R3(1) H_R3(0)
I(63) I(62) I(61) I(60) I(59) I(58) I(57) I(56) I(55) H_R4(3) H_R4(2) H_R4(1) H_R4(0)
I(52) I(51) I(50) I(49) I(48) I(47) I(46) I(45) I(44) H_R5(3) H_R5(2) H_R5(1) H_R5(0)
I(41) I(40) I(39) I(38) I(37) I(36) I(35) I(34) I(33) H_R6(3) H_R6(2) H_R6(1) H_R6(0)
I(30) I(29) I(28) I(27) I(26) I(25) I(24) I(23) I(22) H_R7(3) H_R7(2) H_R7(1) H_R7(0)
I(19) I(18) I(17) I(16) I(15) I(14) I(13) I(12) I(11) H_R8(3) H_R8(2) H_R8(1) H_R8(0)
I(8) I(7) I(6) I(5) I(4) I(3) I(2) I(1) I(0) H_R9(3) H_R9(2) H_R9(1) H_R9(0)
H_C3(3) H_C4(3) H_C5(3) H_C6(3) H_C7(3) H_C8(3) H_C9(3) H_C10(3) H_C11(3) H_C12(3) H_C13(3) H_C14(3) H_C15(3)
H_C3(2) H_C4(2) H_C5(2) H_C6(2) H_C7(2) H_C8(2) H_C9(2) H_C10(2) H_C11(2) H_C12(2) H_C13(2) H_C14(2) H_C15(2)
H_C3(1) H_C4(1) H_C5(1) H_C6(1) H_C7(1) H_C8(1) H_C9(1) H_C10(1) H_C11(1) H_C12(1) H_C13(1) H_C14(1) H_C15(1)
H_C3(0) H_C4(0) H_C5(0) H_C6(0) H_C7(0) H_C8(0) H_C9(0) H_C10(0) H_C11(0) H_C12(0) H_C13(0) H_C14(0) H_C15(0)
R(2)
I(87)
I(76)
I(65)
I(54)
I(43)
I(32)
I(21)
I(10)
H_C1(3)
H_C1(2)
H_C1(1)
H_C1(0)
R(1)
I(86)
I(75)
I(64)
I(53)
I(42)
I(31)
I(20)
I(9)
H_C2(3)
H_C2(2)
H_C2(1)
H_C2(0)
I(95) I(94) I(93) I(92) I(91) I(90) I(89) I(88)
I(7) I(6) I(5) I(4) I(3) I(2) I(1) I(0)
I_0
I_11
I(87) I(86) I(85) I(84) I(83) I(82) I(81) I(80)
I_1
I(95) I(94) I(93) I(92) I(91) I(90) I(89) I(88)
I(7) I(6) I(5) I(4) I(3) I(2) I(1) I(0)
I_0
I_11
I(87) I(86) I(85) I(84) I(83) I(82) I(81) I(80)
I_1
Figure B.1: BPTC (196,96)
The first step in interleaving the bits for the transmission is to sequentially number the bits of the FEC encoded matrix
first from left-to-right and then from top to bottom. Table B.2 lists the bits of the Encoder Matrix along with their
corresponding indices. In order to pad out the total number of bits to 196, one additional reserved bit, R(3), is set to zero
and added to the matrix and assigned index 0. Each bit is then assigned a new index in the interleaved array where:
Interleave Index = Index × 181 modulo 196
The value of the Interleave Index determines the location of each bit in the transmission array, which is placed in the
payload of the general data burst.
Table B.3 lists the bit ordering after interleaving. The Index values 0 to 195 correspond to the Interleave Index from the
previous table. The resulting array contains 195 bits, numbered from TX(195) down to TX(0) for placement in the
payload of the general data burst.
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Table B.2: Interleaving indices for BPTC (196,96)
Bit Name Index
Interleave
Index
Bit Name Index
Interleave
Index
Bit Name Index
Interleave
Index
R(3) 0 0 I(49) 66 186 H_R9(3) 132 176
R(2) 1 181 I(48) 67 171 H_R9(2) 133 161
R(1) 2 166 I(47) 68 156 H_R9(1) 134 146
R(0) 3 151 I(46) 69 141 H_R9(0) 135 131
I(95) 4 136 I(45) 70 126 H_C1(3) 136 116
I(94) 5 121 I(44) 71 111 H_C2(3) 137 101
I(93) 6 106 H_R5(3) 72 96 H_C3(3) 138 86
I(92) 7 91 H_R5(2) 73 81 H_C4(3) 139 71
I(91) 8 76 H_R5(1) 74 66 H_C5(3) 140 56
I(90) 9 61 H_R5(0) 75 51 H_C6(3) 141 41
I(89) 10 46 I(43) 76 36 H_C7(3) 142 26
I(88) 11 31 I(42) 77 21 H_C8(3) 143 11
H_R1(3) 12 16 I(41) 78 6 H_C9(3) 144 192
H_R1(2) 13 1 I(40) 79 187 H_C10(3) 145 177
H_R1(1) 14 182 I(39) 80 172 H_C11(3) 146 162
H_R1(0) 15 167 I(38) 81 157 H_C12(3) 147 147
I(87) 16 152 I(37) 82 142 H_C13(3) 148 132
I(86) 17 137 I(36) 83 127 H_C14(3) 149 117
I(85) 18 122 I(35) 84 112 H_C15(3) 150 102
I(84) 19 107 I(34) 85 97 H_C1(2) 151 87
I(83) 20 92 I(33) 86 82 H_C2(2) 152 72
I(82) 21 77 H_R6(3) 87 67 H_C3(2) 153 57
I(81) 22 62 H_R6(2) 88 52 H_C4(2) 154 42
I(80) 23 47 H_R6(1) 89 37 H_C5(2) 155 27
I(79) 24 32 H_R6(0) 90 22 H_C6(2) 156 12
I(78) 25 17 I(32) 91 7 H_C7(2) 157 193
I(77) 26 2 I(31) 92 188 H_C8(2) 158 178
H_R2(3) 27 183 I(30) 93 173 H_C9(2) 159 163
H_R2(2) 28 168 I(29) 94 158 H_C10(2) 160 148
H_R2(1) 29 153 I(28) 95 143 H_C11(2) 161 133
H_R2(0) 30 138 I(27) 96 128 H_C12(2) 162 118
I(76) 31 123 I(26) 97 113 H_C13(2) 163 103
I(75) 32 108 I(25) 98 98 H_C14(2) 164 88
I(74) 33 93 I(24) 99 83 H_C15(2) 165 73
I(73) 34 78 I(23) 100 68 H_C1(1) 166 58
I(72) 35 63 I(22) 101 53 H_C2(1) 167 43
I(71) 36 48 H_R7(3) 102 38 H_C3(1) 168 28
I(70) 37 33 H_R7(2) 103 23 H_C4(1) 169 13
I(69) 38 18 H_R7(1) 104 8 H_C5(1) 170 194
I(68) 39 3 H_R7(0) 105 189 H_C6(1) 171 179
I(67) 40 184 I(21) 106 174 H_C7(1) 172 164
I(66) 41 169 I(20) 107 159 H_C8(1) 173 149
H_R3(3) 42 154 I(19) 108 144 H_C9(1) 174 134
H_R3(2) 43 139 I(18) 109 129 H_C10(1) 175 119
H_R3(1) 44 124 I(17) 110 114 H_C11(1) 176 104
H_R3(0) 45 109 I(16) 111 99 H_C12(1) 177 89
I(65) 46 94 I(15) 112 84 H_C13(1) 178 74
I(64) 47 79 I(14) 113 69 H_C14(1) 179 59
I(63) 48 64 I(13) 114 54 H_C15(1) 180 44
I(62) 49 49 I(12) 115 39 H_C1(0) 181 29
I(61) 50 34 I(11) 116 24 H_C2(0) 182 14
I(60) 51 19 H_R8(3) 117 9 H_C3(0) 183 195
I(59) 52 4 H_R8(2) 118 190 H_C4(0) 184 180
I(58) 53 185 H_R8(1) 119 175 H_C5(0) 185 165
I(57) 54 170 H_R8(0) 120 160 H_C6(0) 186 150
I(56) 55 155 I(10) 121 145 H_C7(0) 187 135
I(55) 56 140 I(9) 122 130 H_C8(0) 188 120
H_R4(3) 57 125 I(8) 123 115 H_C9(0) 189 105
H_R4(2) 58 110 I(7) 124 100 H_C10(0) 190 90
H_R4(1) 59 95 I(6) 125 85 H_C11(0) 191 75
H_R4(0) 60 80 I(5) 126 70 H_C12(0) 192 60
I(54) 61 65 I(4) 127 55 H_C13(0) 193 45
I(53) 62 50 I(3) 128 40 H_C14(0) 194 30
I(52) 63 35 I(2) 129 25 H_C15(0) 195 15
I(51) 64 20 I(1) 130 10
I(50) 65 5 I(0) 131 191
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Table B.3: Transmit bit ordering for BPTC (196,96)
Index TX Bit Bit Name Index TX Bit Bit Name Index TX Bit Bit Name
0 TX(195) R(3) 66 TX(129) H_R5(1) 132 TX(63) H_C13(3)
1 TX(194) H_R1(2) 67 TX(128) H_R6(3) 133 TX(62) H_C11(2)
2 TX(193) I(77) 68 TX(127) I(23) 134 TX(61) H_C9(1)
3 TX(192) I(68) 69 TX(126) I(14) 135 TX(60) H_C7(0)
4 TX(191) I(59) 70 TX(125) I(5) 136 TX(59) I(95)
5 TX(190) I(50) 71 TX(124) H_C4(3) 137 TX(58) I(86)
6 TX(189) I(41) 72 TX(123) H_C2(2) 138 TX(57) H_R2(0)
7 TX(188) I(32) 73 TX(122) H_C15(2) 139 TX(56) H_R3(2)
8 TX(187) H_R7(1) 74 TX(121) H_C13(1) 140 TX(55) I(55)
9 TX(186) H_R8(3) 75 TX(120) H_C11(0) 141 TX(54) I(46)
10 TX(185) I(1) 76 TX(119) I(91) 142 TX(53) I(37)
11 TX(184) H_C8(3) 77 TX(118) I(82) 143 TX(52) I(28)
12 TX(183) H_C6(2) 78 TX(117) I(73) 144 TX(51) I(19)
13 TX(182) H_C4(1) 79 TX(116) I(64) 145 TX(50) I(10)
14 TX(181) H_C2(0) 80 TX(115) H_R4(0) 146 TX(49) H_R9(1)
15 TX(180) H_C15(0) 81 TX(114) H_R5(2) 147 TX(48) H_C12(3)
16 TX(179) H_R1(3) 82 TX(113) I(33) 148 TX(47) H_C10(2)
17 TX(178) I(78) 83 TX(112) I(24) 149 TX(46) H_C8(1)
18 TX(177) I(69) 84 TX(111) I(15) 150 TX(45) H_C6(0)
19 TX(176) I(60) 85 TX(110) I(6) 151 TX(44) R(0)
20 TX(175) I(51) 86 TX(109) H_C3(3) 152 TX(43) I(87)
21 TX(174) I(42) 87 TX(108) H_C1(2) 153 TX(42) H_R2(1)
22 TX(173) H_R6(0) 88 TX(107) H_C14(2) 154 TX(41) H_R3(3)
23 TX(172) H_R7(2) 89 TX(106) H_C12(1) 155 TX(40) I(56)
24 TX(171) I(11) 90 TX(105) H_C10(0) 156 TX(39) I(47)
25 TX(170) I(2) 91 TX(104) I(92) 157 TX(38) I(38)
26 TX(169) H_C7(3) 92 TX(103) I(83) 158 TX(37) I(29)
27 TX(168) H_C5(2) 93 TX(102) I(74) 159 TX(36) I(20)
28 TX(167) H_C3(1) 94 TX(101) I(65) 160 TX(35) H_R8(0)
29 TX(166) H_C1(0) 95 TX(100) H_R4(1) 161 TX(34) H_R9(2)
30 TX(165) H_C14(0) 96 TX(99) H_R5(3) 162 TX(33) H_C11(3)
31 TX(164) I(88) 97 TX(98) I(34) 163 TX(32) H_C9(2)
32 TX(163) I(79) 98 TX(97) I(25) 164 TX(31) H_C7(1)
33 TX(162) I(70) 99 TX(96) I(16) 165 TX(30) H_C5(0)
34 TX(161) I(61) 100 TX(95) I(7) 166 TX(29) R(1)
35 TX(160) I(52) 101 TX(94) H_C2(3) 167 TX(28) H_R1(0)
36 TX(159) I(43) 102 TX(93) H_C15(3) 168 TX(27) H_R2(2)
37 TX(158) H_R6(1) 103 TX(92) H_C13(2) 169 TX(26) I(66)
38 TX(157) H_R7(3) 104 TX(91) H_C11(1) 170 TX(25) I(57)
39 TX(156) I(12) 105 TX(90) H_C9(0) 171 TX(24) I(48)
40 TX(155) I(3) 106 TX(89) I(93) 172 TX(23) I(39)
41 TX(154) H_C6(3) 107 TX(88) I(84) 173 TX(22) I(30)
42 TX(153) H_C4(2) 108 TX(87) I(75) 174 TX(21) I(21)
43 TX(152) H_C2(1) 109 TX(86) H_R3(0) 175 TX(20) H_R8(1)
44 TX(151) H_C15(1) 110 TX(85) H_R4(2) 176 TX(19) H_R9(3)
45 TX(150) H_C13(0) 111 TX(84) I(44) 177 TX(18) H_C10(3)
46 TX(149) I(89) 112 TX(83) I(35) 178 TX(17) H_C8(2)
47 TX(148) I(80) 113 TX(82) I(26) 179 TX(16) H_C6(1)
48 TX(147) I(71) 114 TX(81) I(17) 180 TX(15) H_C4(0)
49 TX(146) I(62) 115 TX(80) I(8) 181 TX(14) R(2)
50 TX(145) I(53) 116 TX(79) H_C1(3) 182 TX(13) H_R1(1)
51 TX(144) H_R5(0) 117 TX(78) H_C14(3) 183 TX(12) H_R2(3)
52 TX(143) H_R6(2) 118 TX(77) H_C12(2) 184 TX(11) I(67)
53 TX(142) I(22) 119 TX(76) H_C10(1) 185 TX(10) I(58)
54 TX(141) I(13) 120 TX(75) H_C8(0) 186 TX(9) I(49)
55 TX(140) I(4) 121 TX(74) I(94) 187 TX(8) I(40)
56 TX(139) H_C5(3) 122 TX(73) I(85) 188 TX(7) I(31)
57 TX(138) H_C3(2) 123 TX(72) I(76) 189 TX(6) H_R7(0)
58 TX(137) H_C1(1) 124 TX(71) H_R3(1) 190 TX(5) H_R8(2)
59 TX(136) H_C14(1) 125 TX(70) H_R4(3) 191 TX(4) I(0)
60 TX(135) H_C12(0) 126 TX(69) I(45) 192 TX(3) H_C9(3)
61 TX(134) I(90) 127 TX(68) I(36) 193 TX(2) H_C7(2)
62 TX(133) I(81) 128 TX(67) I(27) 194 TX(1) H_C5(1)
63 TX(132) I(72) 129 TX(66) I(18) 195 TX(0) H_C3(0)
64 TX(131) I(63) 130 TX(65) I(9)
65 TX(130) I(54) 131 TX(64) H_R9(0)
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B.2 Variable length BPTC
B.2.1 Variable length BPTC for embedded signalling
The embedded signalling is protected using a BPTC consisting of Hamming (16,11,4) row codes and simple parity
checks for the column codes as illustrated in figure B.2. As the message size increases, additional rows are added to the
code, allowing the decoder and parser to keep its basic format for all message lengths. If required, pad bits or error
detecting checksums are added to the information in order to round out the length to a multiple of 11 bits.
Simple Parity Check
LC Info
H(16,11) Parity
LC Info
H(16,11) Parity
LC Info
H(16,11) Parity
LC Info
H(16,11) Parity
LC Info
H(16,11) Parity
Simple Parity Check
LC Info
H(16,11) Parity
LC Info
H(16,11) Parity
LC Info
H(16,11) Parity
LC Info
H(16,11) Parity
LC Info
H(16,11) Parity
CACH Burst 2
CACH Burst 3
Embedded Burst 1
Embedded Burst 2
Embedded Burst N / 2
BPTC Encode Matrix: N Rows, 16 Columns
Transmit Matrix N / 2 Rows, 32 Columns
TX(31) TX(0)
MSB’s of Encode Matrix Placed
Sequentially Into Transmit Matrix
Figure B.2: Format for embedded signalling BPTC
The interleaving schedule for the embedded signalling is also shown in figure B.2. The signalling information,
Hamming parity bits, and parity check bits are represented in their FEC encoded form as the BPTC Encode Matrix. The
bits are interleaved for transmission by reading the columns of the encoded matrix top-to-bottom and left-to-right and
writing the bits into the Transmit Matrix rows left-to-right. Each row of the resulting Transmit Matrix is 32 bits long
and is placed in the embedded signalling field of sequential bursts.
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Figure B.3 illustrates the burst format used for embedded signalling. The 9 bytes of LC information, LC(71) - LC(0),
are placed in the matrix as shown. Each row is protected by its own Hamming code, H1 - H7. The bottom row contains
a parity check bit for each column.
LC(71)LC(71) LC(70)LC(70) LC(69)LC(69) LC(68)LC(68) LC(67)LC(67) LC(66)LC(66) LC(65)LC(65) LC(64)LC(64) LC(63)LC(63) LC(62)LC(62) LC(61)LC(61)
H1(4)H1(4) H1(3)H1(3) H1(2)H1(2) H1(1)H1(1) H1(0)H1(0)
LC(60)LC(60) LC(59)LC(59) LC(58)LC(58) LC(57)LC(57) LC(56)LC(56) LC(55)LC(55) LC(54)LC(54) LC(53)LC(53) LC(52)LC(52) LC(51)LC(51) LC(50)LC(50) H2(4)H2(4) H2(3)H2(3) H2(2)H2(2) H2(1)H2(1) H2(0)H2(0)
LC(49)LC(49) LC(48)LC(48) LC(47)LC(47) LC(46)LC(46) LC(45)LC(45) LC(44)LC(44) LC(43)LC(43) LC(42)LC(42) LC(41)LC(41) LC(40)LC(40)
LC(39)LC(39)
H3(4)H3(4) H3(3)H3(3) H3(2)H3(2) H3(1)H3(1) H3(0)H3(0)
LC(38)LC(38) LC(37)LC(37) LC(36)LC(36) LC(35)LC(35) LC(34)LC(34) LC(33)LC(33) LC(32)LC(32) LC(31)LC(31) LC(30)LC(30)
LC(29)LC(29) LC(28)LC(28)
H4(4)H4(4) H4(3)H4(3) H4(2)H4(2) H4(1)H4(1) H4(0)H4(0)
LC(27)LC(27) LC(26)LC(26) LC(25)LC(25) LC(24)LC(24) LC(23)LC(23) LC(22)LC(22) LC(21)LC(21) LC(20)LC(20)
LC(19)LC(19) LC(18)LC(18) LC(17)LC(17)
H5(4)H5(4) H5(3)H5(3) H5(2)H5(2) H5(1)H5(1) H5(0)H5(0)
LC(16)LC(16) LC(15)LC(15) LC(14)LC(14) LC(13)LC(13) LC(12)LC(12) LC(11)LC(11) LC(10)LC(10)
LC(9)LC(9) LC(8)LC(8) LC(7)LC(7) LC(6)LC(6)
H6(4)H6(4) H6(3)H6(3) H6(2)H6(2) H6(1)H6(1) H6(0)H6(0)
LC(5)LC(5) LC(4)LC(4) LC(3)LC(3) LC(2)LC(2) LC(1)LC(1) LC(0)LC(0)
CS(4)CS(4)
CS(3)CS(3)
CS(2)CS(2)
CS(1)CS(1)
CS(0)CS(0) H7(4)H7(4) H7(3)H7(3) H7(2)H7(2) H7(1)H7(1) H7(0)H7(0)
PC(15)PC(15) PC(14)PC(14) PC(13)PC(13) PC(12)PC(12) PC(11)PC(11) PC(10)PC(10) PC(9)PC(9) PC(8)PC(8) PC(7)PC(7) PC(6)PC(6) PC(5)PC(5) PC(4)PC(4) PC(3)PC(3) PC(2)PC(2) PC(1)PC(1) PC(0)PC(0)
LC(71) LC(70) LC(69) LC(68) LC(67) LC(66) LC(65) LC(64)
LC(7) LC(6) LC(5) LC(4) LC(3) LC(2) LC(1) LC(0)
LC_0
LC_8
LC(63) LC(62) LC(61) LC(60) LC(59) LC(58) LC(57) LC(56)
LC_1
LC(71) LC(70) LC(69) LC(68) LC(67) LC(66) LC(65) LC(64)LC(71)LC(71) LC(70)LC(70) LC(69)LC(69) LC(68)LC(68) LC(67)LC(67) LC(66)LC(66) LC(65)LC(65) LC(64)LC(64)
LC(7) LC(6) LC(5) LC(4) LC(3) LC(2) LC(1) LC(0)LC(7)LC(7) LC(6)LC(6) LC(5)LC(5) LC(4)LC(4) LC(3)LC(3) LC(2)LC(2) LC(1)LC(1) LC(0)LC(0)
LC_0
LC_8
LC(63) LC(62) LC(61) LC(60) LC(59) LC(58) LC(57) LC(56)LC(63)LC(63) LC(62)LC(62) LC(61)LC(61) LC(60)LC(60) LC(59)LC(59) LC(58)LC(58) LC(57)LC(57) LC(56)LC(56)
LC_1
LC(71) LC(70)LC(60) LC(59)LC(49) LC(39) LC(29) LC(19) LC(9) PC(15)LC(71)LC(71) LC(70)LC(70)LC(60)LC(60) LC(59)LC(59)LC(49)LC(49) LC(39)LC(39) LC(29)LC(29) LC(19)LC(19) LC(9)LC(9) PC(15)PC(15) LC(16) LC(6) PC(12)LC(16)LC(16) LC(6)LC(6) PC(12)PC(12)
LC(67) LC(66)LC(56) LC(55)LC(45) LC(35) LC(25) LC(15) LC(5) PC(11)LC(67)LC(67) LC(66)LC(66)LC(56)LC(56) LC(55)LC(55)LC(45)LC(45) LC(35)LC(35) LC(25)LC(25) LC(15)LC(15) LC(5)LC(5) PC(11)PC(11) LC(12) LC(2) PC(8)LC(12)LC(12) LC(2)LC(2) PC(8)PC(8)
LC(63) LC(62)LC(52) LC(51)
LC(41)
LC(31) LC(21) LC(11) LC(1)
PC(7)
LC(63)LC(63) LC(62)LC(62)LC(52)LC(52) LC(51)LC(51)
LC(41)LC(41)
LC(31)LC(31) LC(21)LC(21) LC(11)LC(11) LC(1)LC(1)
PC(7)PC(7)
H6(4) H7(4)
PC(4)
H6(4)H6(4) H7(4)H7(4)
PC(4)PC(4)
H1(3)
H1(2)
H2(3)
H2(2)H3(3)
H4(3) H5(3)
H6(3) H7(3) PC(3)
H1(3)H1(3)
H1(2)H1(2)
H2(3)H2(3)
H2(2)H2(2)H3(3)H3(3)
H4(3)H4(3) H5(3)H5(3)
H6(3)H6(3) H7(3)H7(3) PC(3)PC(3) H6(0) H7(0) PC(0)H6(0)H6(0) H7(0)H7(0) PC(0)PC(0)
BPTC Encode Matrix
Transmit Matrix
Burst 1
Burst 2
Burst 3
Burst 4
TX(31) TX(30) TX(29) TX(28) TX(27) TX(26) TX(25) TX(24) TX(23) TX(22) TX(2) TX(1) TX(0)
--------
--------
--------
--------
--------
--------
--------
--------
--------
--------
Figure B.3: Format for burst embedded signalling
The calculation of the 5-bit Checksum (CS) is defined in clause B.3.11.
The interleaving schedule for the encoded LC message is shown in figure B.3. The LC signalling information (LC),
CheckSum (CS), Hamming parity bits (Hx), and Parity Check bits (PC) are represented in their FEC encoded form as
the BPTC Encode Matrix. The parity check bits (PC) shall be chosen such that each column of the BPTC matrix has an
even number of "one" bits. Each of the four rows of the resulting Transmit Matrix is placed in sequential bursts
according to the definition of the voice superframe.
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B.2.2 Variable length BPTC for Reverse Channel
The RC FEC is a special case of the embedded signalling code. The format for the BPTC Encode Matrix is the same as
for the variable length embedded signalling. However, the interleaving is performed differently to provide additional
resistance to errors over a single burst. Figure B.4 illustrates the encoding details for RC signalling. The 11 bits of RC
signalling, RC(10) - RC(0) are placed in the first row of the matrix and protected with a Hamming (16,11,4) code. The
bottom row contains a parity check bit for each column. In this case, the parity check row is identical to the information
row.
RC_0
RC_1
RC(10) RC(9) RC(8) RC(7) RC(6) RC(5) RC(4) RC(3) RC(2) RC(1) RC(0)
H(4) H(3) H(2) H(1) H(0)
PC(15) PC(14) PC(13) PC(12) PC(11) PC(10) PC(9) PC(8) PC(7) PC(6) PC(5) PC(4) PC(3) PC(2) PC(1) PC(0)
RC(10) RC(9) RC(8)
RC(7) RC(6) RC(5) RC(4) RC(3) RC(2) RC(1) RC(0)
RC_0
RC_1
RC_0
RC_1
RC(10) RC(9) RC(8) RC(7) RC(6) RC(5) RC(4) RC(3) RC(2) RC(1) RC(0)
H(4) H(3) H(2) H(1) H(0)
RC(10)RC(10) RC(9)RC(9) RC(8)RC(8) RC(7)RC(7) RC(6)RC(6) RC(5)RC(5) RC(4)RC(4) RC(3)RC(3) RC(2)RC(2) RC(1)RC(1) RC(0)RC(0)
H(4)H(4) H(3)H(3) H(2)H(2) H(1)H(1) H(0)H(0)
PC(15) PC(14) PC(13) PC(12) PC(11) PC(10) PC(9) PC(8) PC(7) PC(6) PC(5) PC(4) PC(3) PC(2) PC(1) PC(0)PC(15)PC(15) PC(14)PC(14) PC(13)PC(13) PC(12)PC(12) PC(11)PC(11) PC(10)PC(10) PC(9)PC(9) PC(8)PC(8) PC(7)PC(7) PC(6)PC(6) PC(5)PC(5) PC(4)PC(4) PC(3)PC(3) PC(2)PC(2) PC(1)PC(1) PC(0)PC(0)
RC(10) RC(9) RC(8)RC(10)RC(10) RC(9)RC(9) RC(8)RC(8)
RC(7) RC(6) RC(5) RC(4) RC(3) RC(2) RC(1) RC(0)RC(7)RC(7) RC(6)RC(6) RC(5)RC(5) RC(4)RC(4) RC(3)RC(3) RC(2)RC(2) RC(1)RC(1) RC(0)RC(0)
BPTC Encode Matrix
Figure B.4: Format for Reverse Channel
The first step in interleaving the bits for the transmission is to sequentially number the bits of the FEC encoded matrix
from top-to-bottom, left-to-right. Table B.4 lists the bits of the Encoder Matrix along with their corresponding indices.
Each bit is then assigned a new index in the interleaved array where:
Interleave Index = Index × 17 modulo 32.
The value of the Interleave Index determines the location of each bit in the transmission array, which is placed in the
embedded field.
Table B.4: Interleaving indices for Reverse Channel
Bit Index
Interleave
Index
Bit Index
Interleave
Index
Bit Index
Interleave
Index
RC(10) 0 0 PC(10) 11 27 H(4) 22 22
PC(15) 1 17 RC(4) 12 12 PC(4) 23 7
RC(9) 2 2 PC(9) 13 29 H(3) 24 24
PC(14) 3 19 RC(3) 14 14 PC(3) 25 9
RC(8) 4 4 PC(8) 15 31 H(2) 26 26
PC(13) 5 21 RC(2) 16 16 PC(2) 27 11
RC(7) 6 6 PC(7) 17 1 H(1) 28 28
PC(12) 7 23 RC(1) 18 18 PC(1) 29 13
RC(6) 8 8 PC(6) 19 3 H(0) 30 30
PC(11) 9 25 RC(0) 20 20 PC(0) 31 15
RC(5) 10 10 PC(5) 21 5
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Table B.5 lists the bit ordering after interleaving. The index values 0 to 31 correspond to the Interleave Index from the
previous table. The resulting array contains 32 bits, numbered from TX(31) down to TX(0) for placement in the
embedded field.
Table B.5: Transmit bit ordering for Reverse Channel
Index Bit TX Bit Index Bit TX Bit Index Bit TX Bit
0 RC(10) TX(31) 11 PC(2) TX(20) 22 H(4) TX(9)
1 PC(7) TX(30) 12 RC(4) TX(19) 23 PC(12) TX(8)
2 RC(9) TX(29) 13 PC(1) TX(18) 24 H(3) TX(7)
3 PC(6) TX(28) 14 RC(3) TX(17) 25 PC(11) TX(6)
4 RC(8) TX(27) 15 PC(0) TX(16) 26 H(2) TX(5)
5 PC(5) TX(26) 16 RC(2) TX(15) 27 PC(10) TX(4)
6 RC(7) TX(25) 17 PC(15) TX(14) 28 H(1) TX(3)
7 PC(4) TX(24) 18 RC(1) TX(13) 29 PC(9) TX(2)
8 RC(6) TX(23) 19 PC(14) TX(12) 30 H(0) TX(1)
9 PC(3) TX(22) 20 RC(0) TX(11) 31 PC(8) TX(0)
10 RC(5) TX(21) 21 PC(13) TX(10)
B.2.3 Variable length BPTC for CACH signalling
The CACH signalling is protected using a BPTC consisting of Hamming (17,12,3) row codes and simple parity checks
for the column codes as illustrated in figure B.5. As the message size increases, additional rows are added to the code. If
required, pad bits or error detecting checksums are added to the information in order to round out the length to a
multiple of 12 bits.
H(17,12) Parity
H(17,12) Parity
H(17,12) Parity
H(17,12) Parity
H(17,12) Parity
Simple Parity Check
CACH Info
CACH Info
CACH Info
CACH Info
CACH Info
BPTC Encode Matrix: N Rows, 17 Columns
Transmit Matrix N Rows, 17 Columns
CACH Burst 2
CACH Burst 3
CACH Burst N-2
CACH Burst N-1
CACH Burst N
CACH Burst 1
MSB’s of Encode
Matrix Placed
Sequentially Into
Transmit Matrix
Figure B.5: Format for CACH BPTC
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The interleaving schedule for the CACH signalling is also shown in figure B.5. The signalling information, Hamming
parity bits, and simple parity check bits are represented in their FEC encoded form as the BPTC Encode Matrix. The
bits are interleaved for transition by reading the columns of the encoded matrix top-to-bottom and left-to-right and
writing the bits into the Transmit Matrix rows left-to-right. Each row of the resulting Transmit Matrix has a length of
17 bits and is placed in the payload field of sequential CACH bursts.
Figure B.6 illustrates the specifics of encoding Short LC messages for transmission in the CACH. The 3 ½ octets of LC
information, LC(27) - LC(0), are placed in the matrix as shown. A 1-byte CRC, CR(7) - CR(0), is also added. This CRC
is defined in clause B.3.7.
LC(26) LC(25) LC(24) LC(23) LC(22) LC(21) LC(20) LC(19) LC(18) LC(17) LC(16)
H1(4) H1(3) H1(2) H1(1) H1(0)
LC(27)
LC(14) LC(13) LC(12) LC(11) LC(10) LC(9) LC(8) LC(7) LC(6) LC(5) LC(4) H2(4) H2(3) H2(2) H2(1) H2(0)LC(15)
LC(2) LC(1) LC(0) CR(7) CR(6) CR(5) CR(4) CR(3) CR(2) CR(1) CR(0)
H3(4) H3(3) H3(2) H3(1) H3(0)
LC(3)
PC(15) PC(14) PC(13) PC(12) PC(11) PC(10) PC(9) PC(8) PC(7) PC(6) PC(5) PC(4) PC(3) PC(2) PC(1) PC(0)PC(16)
LC(26) LC(25) LC(24) LC(23) LC(22) LC(21) LC(20) LC(19) LC(18) LC(17) LC(16)
H1(4) H1(3) H1(2) H1(1) H1(0)
LC(27) LC(26)LC(26) LC(25)LC(25) LC(24)LC(24) LC(23)LC(23) LC(22)LC(22) LC(21)LC(21) LC(20)LC(20) LC(19)LC(19) LC(18)LC(18) LC(17)LC(17) LC(16)LC(16)
H1(4)H1(4) H1(3)H1(3) H1(2)H1(2) H1(1)H1(1) H1(0)H1(0)
LC(27)LC(27)
LC(14) LC(13) LC(12) LC(11) LC(10) LC(9) LC(8) LC(7) LC(6) LC(5) LC(4) H2(4) H2(3) H2(2) H2(1) H2(0)LC(15) LC(14)LC(14) LC(13)LC(13) LC(12)LC(12) LC(11)LC(11) LC(10)LC(10) LC(9)LC(9) LC(8)LC(8) LC(7)LC(7) LC(6)LC(6) LC(5)LC(5) LC(4)LC(4) H2(4)H2(4) H2(3)H2(3) H2(2)H2(2) H2(1)H2(1) H2(0)H2(0)LC(15)LC(15)
LC(2) LC(1) LC(0) CR(7) CR(6) CR(5) CR(4) CR(3) CR(2) CR(1) CR(0)
H3(4) H3(3) H3(2) H3(1) H3(0)
LC(3) LC(2)LC(2) LC(1)LC(1) LC(0)LC(0) CR(7)CR(7) CR(6)CR(6) CR(5)CR(5) CR(4)CR(4) CR(3)CR(3) CR(2)CR(2) CR(1)CR(1) CR(0)CR(0)
H3(4)H3(4) H3(3)H3(3) H3(2)H3(2) H3(1)H3(1) H3(0)H3(0)
LC(3)LC(3)
PC(15) PC(14) PC(13) PC(12) PC(11) PC(10) PC(9) PC(8) PC(7) PC(6) PC(5) PC(4) PC(3) PC(2) PC(1) PC(0)PC(16) PC(15)PC(15) PC(14)PC(14) PC(13)PC(13) PC(12)PC(12) PC(11)PC(11) PC(10)PC(10) PC(9)PC(9) PC(8)PC(8) PC(7)PC(7) PC(6)PC(6) PC(5)PC(5) PC(4)PC(4) PC(3)PC(3) PC(2)PC(2) PC(1)PC(1) PC(0)PC(0)PC(16)PC(16)
LC(27)LC(27) LC(26)LC(26) LC(25)LC(25) LC(24)LC(24)
CR(7) CR(6) CR(5) CR(4) CR(3) CR(2) CR(1) CR(0)CR(7)CR(7) CR(6)CR(6) CR(5)CR(5) CR(4)CR(4) CR(3)CR(3) CR(2)CR(2) CR(1)CR(1) CR(0)CR(0)
LC_0
CRC_0
LC(23) LC(22) LC(21) LC(20) LC(19) LC(18) LC(17) LC(16)LC(23)LC(23) LC(22)LC(22) LC(21)LC(21) LC(20)LC(20) LC(19)LC(19) LC(18)LC(18) LC(17)LC(17) LC(16)LC(16)
LC_1
BPTC Encode Matrix
CR(2)CR(2) LC(17)LC(17) LC(5)LC(5) CR(1)CR(1)LC(6)LC(6) CR(0)CR(0)LC(18)LC(18) LC(4)LC(4)CR(3)CR(3)
LC(22)LC(22) LC(8)LC(8)LC(10)LC(10) CR(4)CR(4)CR(6)CR(6) LC(19)LC(19)LC(21)LC(21) LC(9)LC(9) LC(20)LC(20)CR(7)CR(7) LC(7)LC(7)
LC(3)LC(3) LC(24)LC(24) LC(12)LC(12)LC(26)LC(26) LC(0)LC(0)LC(14)LC(14) LC(2)LC(2) LC(1)LC(1)LC(15)LC(15) LC(13)LC(13) LC(23)LC(23)LC(27)LC(27)
Transmit Matrix
CACH 1
CACH 2
CACH 3
CACH 4
P(16) P(15) P(14) P(13) P(12) P(11) P(10) P(9) P(8) P(7) P(6) P(5) P(4) P(3) P(2) P(1) P(0)
LC(11)LC(11)
LC(25)LC(25)
CR(5)CR(5)
LC(16)LC(16)
PC(15)PC(15) PC(14)PC(14) PC(13)PC(13)
PC(12)PC(12) PC(11)PC(11) PC(10)PC(10) PC(9)PC(9)
PC(8)PC(8) PC(7)PC(7) PC(6)PC(6) PC(5)PC(5)
PC(4)PC(4) PC(3)PC(3) PC(2)PC(2) PC(1)PC(1) PC(0)PC(0)
PC(16)PC(16)
H1(4)H1(4)
H1(3)H1(3) H1(2)H1(2) H1(1)H1(1) H1(0)H1(0)
H2(4)H2(4)
H2(3)H2(3) H2(2)H2(2) H2(1)H2(1) H2(0)H2(0)
H3(4)H3(4)
H3(3)H3(3) H3(2)H3(2) H3(1)H3(1) H3(0)H3(0)
LC(15) LC(14) LC(13) LC(12) LC(11) LC(10) LC(9) LC(8)
LC_2
LC(15) LC(14) LC(13) LC(12) LC(11) LC(10) LC(9) LC(8)LC(15)LC(15) LC(14)LC(14) LC(13)LC(13) LC(12)LC(12) LC(11)LC(11) LC(10)LC(10) LC(9)LC(9) LC(8)LC(8)
LC_2
LC(7) LC(6) LC(5) LC(4) LC(3) LC(2) LC(1) LC(0)
LC_3
LC(7) LC(6) LC(5) LC(4) LC(3) LC(2) LC(1) LC(0)LC(7)LC(7) LC(6)LC(6) LC(5)LC(5) LC(4)LC(4) LC(3)LC(3) LC(2)LC(2) LC(1)LC(1) LC(0)LC(0)
LC_3
Figure B.6: Format for Short LC in CACH
The interleaving schedule for the 4-burst CACH message is also shown in figure B.6. The signalling information (LC),
Hamming parity bits (Hx), and parity check bits (PC) are represented in their FEC encoded form as the
BPTC Encode Matrix. The parity check bits (PC) shall be chosen such that each column of the BPTC matrix has an
even number of "one" bits. Each of the four rows of the Transmit Matrix are placed in sequential CACH bursts.
For the Short LC messages an 8-bit CRC shall be used as described in clause B.3.7.
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B.2.4 Rate ¾ Trellis code
The data blocks for Unconfirmed and Confirmed data packets use a rate ¾ trellis code. The encoding process of the rate
¾ code is diagrammed in figure B.7.
I(140) I(139) I(138)
Tribit_1
I(140) I(139) I(138)
Tribit_1
I(2) I(1) I(0)
Tribit_47
I(2) I(1) I(0)
Tribit_47
%0 %0 %0
Tribit_48
%0 %0 %0
Tribit_48
Flushing
Tribit
I(7) I(6) I(5) I(4) I(3) I(2) I(1) I(0)
I_0
I_17
I(135) I(134) I(133) I(132) I(131) I(130) I(129) I(128)
I_1
I(143) I(142) I(141) I(140) I(139) I(138) I(137) I(136)
I(7) I(6) I(5) I(4) I(3) I(2) I(1) I(0)
I_0
I_17
I(135) I(134) I(133) I(132) I(131) I(130) I(129) I(128)
I_1
I(143) I(142) I(141) I(140) I(139) I(138) I(137) I(136)
Finite
State
Machine
Finite
State
Machine
InterleaverInterleaver
Enc_Dibit(0:97) Trellis_Dibit(97:0)
I(143) I(142) I(141)
Tribit_0
I(143) I(142) I(141)
Tribit_0
Figure B.7: Rate ¾ Trellis encoder overview
The encoding process begins by serializing a sequence of octets as shown, from left to right, and then separating the
result into a serial stream of tribits. Each tribit contains three bits with the most significant bit to the left and the least
significant bit to the right. Consequently, each tribit is represented by an octal number in the range 0 to 7. The tribit
stream is applied to the trellis encoder, starting with tribit 0 and ending with tribit m-1.
Table B.6: Trellis code word sizes
Rate ¾
Input Size 48 tribits
Output Size 98 dibits
(n,k) (196,144)
The Trellis encoder is implemented as a finite state machine, or FSM. It appends a 000
2
tribit at the end of the stream to
flush out the final state. The dibits on the output are mapped to ±1, ±3 amplitudes and then interleaved before being
modulated.
The Trellis encoder receives m tribits as input, and outputs 2m dibits. The encoding process is diagrammed below in
figure B.8. The encoder is an 8-state Finite State Machine (FSM) for the code rate ¾, with an initial state of zero. The
FSM used in this particular implementation has the special property of having the current input as the next state. For
each tribit input, there is a corresponding output constellation point which is represented as a dibit pair.
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state
Current
State
Storage
Finite State
Machine
Transition
Table
Input Tribits
Constellation
Point Output
(Dibit Pair)
input
state
Current
State
Storage
Finite State
Machine
Transition
Table
Input Tribits
Constellation
Point Output
(Dibit Pair)
input
Figure B.8: Trellis encoder block diagram
The state transition is shown in table B.7. The output of the state transition table is one of 16 constellation points. The
constellation to dibit pair mapping is shown in table B.8.
Table B.7: Trellis encoder state transition table
Input Tribit
0 1 2 3 4 5 6 7
0
0 8 4 12 2 10 6 14
1
4 12 2 10 6 14 0 8
2
1 9 5 13 3 11 7 15
FSM 3
5 13 3 11 7 15 1 9
State 4
3 11 7 15 1 9 5 13
5
7 15 1 9 5 13 3 11
6
2 10 6 14 0 8 4 12
7
6 14 0 8 4 12 2 10
Table B.8: Constellation to dibit pair mapping
Constellation Point Dibit 0 Dibit 1 Constellation Point Dibit 0 Dibit 1
0 +1 -1 8 -3 +3
1 -1 -1 9 +3 +3
2 +3 -3 10 -1 +1
3 -3 -3 11 +1 +1
4 -3 -1 12 +1 +3
5 +3 -1 13 -1 +3
6 -1 -3 14 +3 +1
7 +1 -3 15 -3 +1
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Interleaving is done for data blocks for the code rate ¾. The purpose of the interleaver is to spread burst errors due to
Rayleigh fading over the 98 dibit block. In the interleaver, the dibit array is rearranged to form another dibit array
according to the interleave table shown in table B.9.
Table B.9: Interleaving schedule for rate ¾ Trellis code
Interleave Table
Enc
Index
Input
Index
Enc
Index
Input
Index
Enc
Index
Input
Index
Enc
Index
Input
Index
0 0 26 2 50 4 74 6
1 1 27 3 51 5 75 7
2 8 28 10 52 12 76 14
3 9 29 11 53 13 77 15
4 16 30 18 54 20 78 22
5 17 31 19 55 21 79 23
6 24 32 26 56 28 80 30
7 25 33 27 57 29 81 31
8 32 34 34 58 36 82 38
9 33 35 35 59 37 83 39
10 40 36 42 60 44 84 46
11 41 37 43 61 45 85 47
12 48 38 50 62 52 86 54
13 49 39 51 63 53 87 55
14 56 40 58 64 60 88 62
15 57 41 59 65 61 89 63
16 64 42 66 66 68 90 70
17 65 43 67 67 69 91 71
18 72 44 74 68 76 92 78
19 73 45 75 69 77 93 79
20 80 46 82 70 84 94 86
21 81 47 83 71 85 95 87
22 88 48 90 72 92 96 94
23 89 49 91 73 93 97 95
24 96
25 97
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Table B.10 provides the transmit bit order based on the interleaving schedule. The 98 Trellis Dibits that are placed in
the general data burst for transmission are listed out along with the corresponding dibits that are output from the
encoder.
Table B.10: Transmit bit ordering for rate ¾ Trellis code
Index TX Dibit Dibit Index TX Dibit Dibit
0 Trellis_Dibit(97) Enc_Dibit(0) 49 Trellis_Dibit(48) Enc_Dibit(91)
1 Trellis_Dibit(96) Enc_Dibit(1) 50 Trellis_Dibit(47) Enc_Dibit(4)
2 Trellis_Dibit(95) Enc_Dibit(8) 51 Trellis_Dibit(46) Enc_Dibit(5)
3 Trellis_Dibit(94) Enc_Dibit(9) 52 Trellis_Dibit(45) Enc_Dibit(12)
4 Trellis_Dibit(93) Enc_Dibit(16) 53 Trellis_Dibit(44) Enc_Dibit(13)
5 Trellis_Dibit(92) Enc_Dibit(17) 54 Trellis_Dibit(43) Enc_Dibit(20)
6 Trellis_Dibit(91) Enc_Dibit(24) 55 Trellis_Dibit(42) Enc_Dibit(21)
7 Trellis_Dibit(90) Enc_Dibit(25) 56 Trellis_Dibit(41) Enc_Dibit(28)
8 Trellis_Dibit(89) Enc_Dibit(32) 57 Trellis_Dibit(40) Enc_Dibit(29)
9 Trellis_Dibit(88) Enc_Dibit(33) 58 Trellis_Dibit(39) Enc_Dibit(36)
10 Trellis_Dibit(87) Enc_Dibit(40) 59 Trellis_Dibit(38) Enc_Dibit(37)
11 Trellis_Dibit(86) Enc_Dibit(41) 60 Trellis_Dibit(37) Enc_Dibit(44)
12 Trellis_Dibit(85) Enc_Dibit(48) 61 Trellis_Dibit(36) Enc_Dibit(45)
13 Trellis_Dibit(84) Enc_Dibit(49) 62 Trellis_Dibit(35) Enc_Dibit(52)
14 Trellis_Dibit(83) Enc_Dibit(56) 63 Trellis_Dibit(34) Enc_Dibit(53)
15 Trellis_Dibit(82) Enc_Dibit(57) 64 Trellis_Dibit(33) Enc_Dibit(60)
16 Trellis_Dibit(81) Enc_Dibit(64) 65 Trellis_Dibit(32) Enc_Dibit(61)
17 Trellis_Dibit(80) Enc_Dibit(65) 66 Trellis_Dibit(31) Enc_Dibit(68)
18 Trellis_Dibit(79) Enc_Dibit(72) 67 Trellis_Dibit(30) Enc_Dibit(69)
19 Trellis_Dibit(78) Enc_Dibit(73) 68 Trellis_Dibit(29) Enc_Dibit(76)
20 Trellis_Dibit(77) Enc_Dibit(80) 69 Trellis_Dibit(28) Enc_Dibit(77)
21 Trellis_Dibit(76) Enc_Dibit(81) 70 Trellis_Dibit(27) Enc_Dibit(84)
22 Trellis_Dibit(75) Enc_Dibit(88) 71 Trellis_Dibit(26) Enc_Dibit(85)
23 Trellis_Dibit(74) Enc_Dibit(89) 72 Trellis_Dibit(25) Enc_Dibit(92)
24 Trellis_Dibit(73) Enc_Dibit(96) 73 Trellis_Dibit(24) Enc_Dibit(93)
25 Trellis_Dibit(72) Enc_Dibit(97) 74 Trellis_Dibit(23) Enc_Dibit(6)
26 Trellis_Dibit(71) Enc_Dibit(2) 75 Trellis_Dibit(22) Enc_Dibit(7)
27 Trellis_Dibit(70) Enc_Dibit(3) 76 Trellis_Dibit(21) Enc_Dibit(14)
28 Trellis_Dibit(69) Enc_Dibit(10) 77 Trellis_Dibit(20) Enc_Dibit(15)
29 Trellis_Dibit(68) Enc_Dibit(11) 78 Trellis_Dibit(19) Enc_Dibit(22)
30 Trellis_Dibit(67) Enc_Dibit(18) 79 Trellis_Dibit(18) Enc_Dibit(23)
31 Trellis_Dibit(66) Enc_Dibit(19) 80 Trellis_Dibit(17) Enc_Dibit(30)
32 Trellis_Dibit(65) Enc_Dibit(26) 81 Trellis_Dibit(16) Enc_Dibit(31)
33 Trellis_Dibit(64) Enc_Dibit(27) 82 Trellis_Dibit(15) Enc_Dibit(38)
34 Trellis_Dibit(63) Enc_Dibit(34) 83 Trellis_Dibit(14) Enc_Dibit(39)
35 Trellis_Dibit(62) Enc_Dibit(35) 84 Trellis_Dibit(13) Enc_Dibit(46)
36 Trellis_Dibit(61) Enc_Dibit(42) 85 Trellis_Dibit(12) Enc_Dibit(47)
37 Trellis_Dibit(60) Enc_Dibit(43) 86 Trellis_Dibit(11) Enc_Dibit(54)
38 Trellis_Dibit(59) Enc_Dibit(50) 87 Trellis_Dibit(10) Enc_Dibit(55)
39 Trellis_Dibit(58) Enc_Dibit(51) 88 Trellis_Dibit(9) Enc_Dibit(62)
40 Trellis_Dibit(57) Enc_Dibit(58) 89 Trellis_Dibit(8) Enc_Dibit(63)
41 Trellis_Dibit(56) Enc_Dibit(59) 90 Trellis_Dibit(7) Enc_Dibit(70)
42 Trellis_Dibit(55) Enc_Dibit(66) 91 Trellis_Dibit(6) Enc_Dibit(71)
43 Trellis_Dibit(54) Enc_Dibit(67) 92 Trellis_Dibit(5) Enc_Dibit(78)
44 Trellis_Dibit(53) Enc_Dibit(74) 93 Trellis_Dibit(4) Enc_Dibit(79)
45 Trellis_Dibit(52) Enc_Dibit(75) 94 Trellis_Dibit(3) Enc_Dibit(86)
46 Trellis_Dibit(51) Enc_Dibit(82) 95 Trellis_Dibit(2) Enc_Dibit(87)
47 Trellis_Dibit(50) Enc_Dibit(83) 96 Trellis_Dibit(1) Enc_Dibit(94)
48 Trellis_Dibit(49) Enc_Dibit(90) 97 Trellis_Dibit(0) Enc_Dibit(95)
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B.2.5 Rate 1 coded data
Rate 1 coding is used to transmit data blocks for Confirmed or Unconfirmed data packets as described in clause 8.2.2.1
and clause 8.2.2.2. No encoding rules apply to the payload as shown in figure B.8A.
A simple encoding algorithm is done for data blocks for the code rate 1. The main purpose of this algorithm is to adapt
the 192 payload bit to the 196 packet size bits. The algorithm is shown in table B.10B that illustrates the transmit bit
order for the data bits.
Figure B.8A: Rate 1 user data
To reach the 196 bits length from 192 used data four padding bits shall be added. These four bits are all set to zero as
shown in table B.10A.
Table B.10A: Padding bits for rate 1 coded data
Pad bit Value
P(0) 0
P(1) 0
P(2) 0
P(3) 0
The transmit bit order using information bits and padding bits is illustrated in table B.10B.
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Table B.10B: Transmit bit ordering for rate 1 coded data
Index TX Bit Bit Name Index TX Bit Bit Name Index TX Bit Bit Name
0 TX(195) I(191) 66 TX(129) I(125) 132 TX(63) I(63)
1 TX(194) I(190) 67 TX(128) I(124) 133 TX(62) I(62)
2 TX(193) I(189) 68 TX(127) I(123) 134 TX(61) I(61)
3 TX(192) I(188) 69 TX(126) I(122) 135 TX(60) I(60)
4 TX(191) I(187) 70 TX(125) I(121) 136 TX(59) I(59)
5 TX(190) I(186) 71 TX(124) I(120) 137 TX(58) I(58)
6 TX(189) I(185) 72 TX(123) I(119) 138 TX(57) I(57)
7 TX(188) I(184) 73 TX(122) I(118) 139 TX(56) I(56)
8 TX(187) I(183) 74 TX(121) I(117) 140 TX(55) I(55)
9 TX(186) I(182) 75 TX(120) I(116) 141 TX(54) I(54)
10 TX(185) I(181) 76 TX(119) I(115) 142 TX(53) I(53)
11 TX(184) I(180) 77 TX(118) I(114) 143 TX(52) I(52)
12 TX(183) I(179) 78 TX(117) I(113) 144 TX(51) I(51)
13 TX(182) I(178) 79 TX(116) I(112) 145 TX(50) I(50)
14 TX(181) I(177) 80 TX(115) I(111) 146 TX(49) I(49)
15 TX(180) I(176) 81 TX(114) I(110) 147 TX(48) I(48)
16 TX(179) I(175) 82 TX(113) I(109) 148 TX(47) I(47)
17 TX(178) I(174) 83 TX(112) I(108) 149 TX(46) I(46)
18 TX(177) I(173) 84 TX(111) I(107) 150 TX(45) I(45)
19 TX(176) I(172) 85 TX(110) I(106) 151 TX(44) I(44)
20 TX(175) I(171) 86 TX(109) I(105) 152 TX(43) I(43)
21 TX(174) I(170) 87 TX(108) I(104) 153 TX(42) I(42)
22 TX(173) I(169) 88 TX(107) I(103) 154 TX(41) I(41)
23 TX(172) I(168) 89 TX(106) I(102) 155 TX(40) I(40)
24 TX(171) I(167) 90 TX(105) I(101) 156 TX(39) I(39)
25 TX(170) I(166) 91 TX(104) I(100) 157 TX(38) I(38)
26 TX(169) I(165) 92 TX(103) I(99) 158 TX(37) I(37)
27 TX(168) I(164) 93 TX(102) I(98) 159 TX(36) I(36)
28 TX(167) I(163) 94 TX(101) I(97) 160 TX(35) I(35)
29 TX(166) I(162) 95 TX(100) I(96) 161 TX(34) I(34)
30 TX(165) I(161) 96 TX(99) P(0) 162 TX(33) I(33)
31 TX(164) I(160) 97 TX(98) P(1) 163 TX(32) I(32)
32 TX(163) I(159) 98 TX(97) P(2) 164 TX(31) I(31)
33 TX(162) I(158) 99 TX(96) P(3) 165 TX(30) I(30)
34 TX(161) I(157) 100 TX(95) I(95) 166 TX(29) I(29)
35 TX(160) I(156) 101 TX(94) I(94) 167 TX(28) I(28)
36 TX(159) I(155) 102 TX(93) I(93) 168 TX(27) I(27)
37 TX(158) I(154) 103 TX(92) I(92) 169 TX(26) I(26)
38 TX(157) I(153) 104 TX(91) I(91) 170 TX(25) I(25)
39 TX(156) I(152) 105 TX(90) I(90) 171 TX(24) I(24)
40 TX(155) I(151) 106 TX(89) I(89) 172 TX(23) I(23)
41 TX(154) I(150) 107 TX(88) I(88) 173 TX(22) I(22)
42 TX(153) I(149) 108 TX(87) I(87) 174 TX(21) I(21)
43 TX(152) I(148) 109 TX(86) I(86) 175 TX(20) I(20)
44 TX(151) I(147) 110 TX(85) I(85) 176 TX(19) I(19)
45 TX(150) I(146) 111 TX(84) I(84) 177 TX(18) I(18)
46 TX(149) I(145) 112 TX(83) I(83) 178 TX(17) I(17)
47 TX(148) I(144) 113 TX(82) I(82) 179 TX(16) I(16)
48 TX(147) I(143) 114 TX(81) I(81) 180 TX(15) I(15)
49 TX(146) I(142) 115 TX(80) I(80) 181 TX(14) I(14)
50 TX(145) I(141) 116 TX(79) I(79) 182 TX(13) I(13)
51 TX(144) I(140) 117 TX(78) I(78) 183 TX(12) I(12)
52 TX(143) I(139) 118 TX(77) I(77) 184 TX(11) I(11)
53 TX(142) I(138) 119 TX(76) I(76) 185 TX(10) I(10)
54 TX(141) I(137) 120 TX(75) I(75) 186 TX(9) I(9)
55 TX(140) I(136) 121 TX(74) I(74) 187 TX(8) I(8)
56 TX(139) I(135) 122 TX(73) I(73) 188 TX(7) I(7)
57 TX(138) I(134) 123 TX(72) I(72) 189 TX(6) I(6)
58 TX(137) I(133) 124 TX(71) I(71) 190 TX(5) I(5)
59 TX(136) I(132) 125 TX(70) I(70) 191 TX(4) I(4)
60 TX(135) I(131) 126 TX(69) I(69) 192 TX(3) I(3)
61 TX(134) I(130) 127 TX(68) I(68) 193 TX(2) I(2)
62 TX(133) I(129) 128 TX(67) I(67) 194 TX(1) I(1)
63 TX(132) I(128) 129 TX(66) I(66) 195 TX(0) I(0)
64 TX(131) I(127) 130 TX(65) I(65)
65 TX(130) I(126) 131 TX(64) I(64)
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B.3 Generator matrices and polynomials
B.3.1 Golay (20,8)
The (20,8,7) Golay code is derived by shortening the primitive code generated from the polynomial g(x) given below:
g(x) = x
11
+ x
10
+ x
6
+ x
5
+ x
4
+ x
2
+ 1 = 6165
8
(B.1)
The generator matrix is given in table B.11.
Table B.11: Golay (20,8) generator matrix
1 0 0 0 0 0 0 0
0 0 1 1 1 1 0 1 1 0 1 0
0 1 0 0 0 0 0 0
1 1 0 1 1 0 0 1 1 0 0 1
0 0 1 0 0 0 0 0
0 1 1 0 1 1 0 0 1 1 0 1
0 0 0 1 0 0 0 0
0 0 1 1 0 1 1 0 0 1 1 1
0 0 0 0 1 0 0 0
1 1 0 1 1 1 0 0 0 1 1 0
0 0 0 0 0 1 0 0
1 0 1 0 1 0 0 1 0 1 1 1
0 0 0 0 0 0 1 0
1 0 0 1 0 0 1 1 1 1 1 0
0 0 0 0 0 0 0 1
1 0 0 0 1 1 1 0 1 0 1 1
B.3.2 Quadratic residue (16,7,6)
The (16,7,6) is a shortened quadratic residue code is formed from the primitive (17,9,5) by deleting the first two
information bits and extending by adding a single parity check bit to the end. The generator polynomial of the
primitive (17,9,5) quadratic residue code is as follows:
G(x) = x
8
+ x
5
+ x
4
+ x
3
+ 1 = 471
8
(B.2)
The generator matrix is given in table B.12.
Table B.12: Quadratic Residue (16,7,6) generator matrix
1 0 0 0 0 0 0
0 0 1 0 0 1 1 1 1
0 1 0 0 0 0 0
1 0 0 0 1 1 1 1 0
0 0 1 0 0 0 0
1 1 0 1 1 0 1 1 1
0 0 0 1 0 0 0
1 1 1 1 0 0 0 1 0
0 0 0 0 1 0 0
1 1 1 0 0 1 0 0 1
0 0 0 0 0 1 0
0 1 1 1 0 0 1 0 1
0 0 0 0 0 0 1
0 0 1 1 1 0 0 1 1
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B.3.3 Hamming (17,12,3)
The (17,12,3) Hamming code is derived from shortening the primitive code generated from the polynomial g(x) given
below:
g(x) = x
5
+ x
2
+ 1 = 45
8
(B.3)
The generator matrix is given in table B.13.
Table B.13: Hamming (17,12,3) generator matrix
1 0 0 0 0 0 0 0 0 0 0 0
1 1 0 1 1
0 1 0 0 0 0 0 0 0 0 0 0
1 1 1 1 1
0 0 1 0 0 0 0 0 0 0 0 0
1 1 1 0 1
0 0 0 1 0 0 0 0 0 0 0 0
1 1 1 0 0
0 0 0 0 1 0 0 0 0 0 0 0
0 1 1 1 0
0 0 0 0 0 1 0 0 0 0 0 0
0 0 1 1 1
0 0 0 0 0 0 1 0 0 0 0 0
1 0 0 0 1
0 0 0 0 0 0 0 1 0 0 0 0
1 1 0 1 0
0 0 0 0 0 0 0 0 1 0 0 0
0 1 1 0 1
0 0 0 0 0 0 0 0 0 1 0 0
1 0 1 0 0
0 0 0 0 0 0 0 0 0 0 1 0
0 1 0 1 0
0 0 0 0 0 0 0 0 0 0 0 1
0 0 1 0 1
B.3.4 Hamming (13,9,3), Hamming (15,11,3), and Hamming
(16,11,4)
The generator matrices for the (16,11,4) Hamming code and the (13,9,3) Hamming code are derived from the
(15,11,3) primitive Hamming code. The generator polynomial for the primitive code is as follows:
G(x) = x
4
+ x + 1 = 23
8
(B.4)
The generator matrices are given in tables B.14 to B.16.
Table B.14: Hamming (13,9,3) generator matrix
1 0 0 0 0 0 0 0 0
1 1 1 1
0 1 0 0 0 0 0 0 0
1 1 1 0
0 0 1 0 0 0 0 0 0
0 1 1 1
0 0 0 1 0 0 0 0 0
1 0 1 0
0 0 0 0 1 0 0 0 0
0 1 0 1
0 0 0 0 0 1 0 0 0
1 0 1 1
0 0 0 0 0 0 1 0 0
1 1 0 0
0 0 0 0 0 0 0 1 0
0 1 1 0
0 0 0 0 0 0 0 0 1
0 0 1 1
Table B.15: Hamming (15,11,3) generator matrix
1 0 0 0 0 0 0 0 0 0 0
1 0 0 1
0 1 0 0 0 0 0 0 0 0 0
1 1 0 1
0 0 1 0 0 0 0 0 0 0 0
1 1 1 1
0 0 0 1 0 0 0 0 0 0 0
1 1 1 0
0 0 0 0 1 0 0 0 0 0 0
0 1 1 1
0 0 0 0 0 1 0 0 0 0 0
1 0 1 0
0 0 0 0 0 0 1 0 0 0 0
0 1 0 1
0 0 0 0 0 0 0 1 0 0 0
1 0 1 1
0 0 0 0 0 0 0 0 1 0 0
1 1 0 0
0 0 0 0 0 0 0 0 0 1 0
0 1 1 0
0 0 0 0 0 0 0 0 0 0 1
0 0 1 1
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Table B.16: Hamming (16,11,4) generator matrix
1 0 0 0 0 0 0 0 0 0 0
1 0 0 1 1
0 1 0 0 0 0 0 0 0 0 0
1 1 0 1 0
0 0 1 0 0 0 0 0 0 0 0
1 1 1 1 1
0 0 0 1 0 0 0 0 0 0 0
1 1 1 0 0
0 0 0 0 1 0 0 0 0 0 0
0 1 1 1 0
0 0 0 0 0 1 0 0 0 0 0
1 0 1 0 1
0 0 0 0 0 0 1 0 0 0 0
0 1 0 1 1
0 0 0 0 0 0 0 1 0 0 0
1 0 1 1 0
0 0 0 0 0 0 0 0 1 0 0
1 1 0 0 1
0 0 0 0 0 0 0 0 0 1 0
0 1 1 0 1
0 0 0 0 0 0 0 0 0 0 1
0 0 1 1 1
B.3.5 Hamming (7,4,3)
The H(7,4,3) is a primitive Hamming code. The generator polynomial for the primitive code is as follows:
G(x) = x
3
+ x + 1 = 13
8
(B.5)
The generator matrix is given in table B.17.
Table B.17: Hamming (7,4,3) generator matrix
1 0 0 0
1 0 1
0 1 0 0
1 1 1
0 0 1 0
1 1 0
0 0 0 1
0 1 1
B.3.6 Reed-Solomon (12,9)
The Reed-Solomon code for the Link Control checksum is constructed over the GF(2
8
) field. The (12,9,4) code is
shortened from the (255,252,4) code by setting the first 243 message symbols for the code word to nulls (0). The
generator polynomial of the (12,9,4) Reed-Solomon code is given by the following formula:
G(x) = (x +
α) (x + α
2
) (x + α
3
) (B.6)
g(x) = x
3
+ 0e x
2
+ 38 x + 40 (B.7)
NOTE 1: Coefficients are in hexadecimal radix while exponents are in decimal radix.
The generator matrix is easily constructed from the generator polynomial. In the case of the Reed-Solomon code, the
generator matrix uses GF(2
8
) symbols of 8 bits each.
Table B.18: Reed-Solomon (12,9) generator matrix
01 00 00 00 00 00 00 00 00
1C BC FD
00 01 00 00 00 00 00 00 00
89 31 08
00 00 01 00 00 00 00 00 00
AD 41 36
00 00 00 01 00 00 00 00 00
7D 71 16
00 00 00 00 01 00 00 00 00
F3 A6 3A
00 00 00 00 00 01 00 00 00
08 83 7B
00 00 00 00 00 00 01 00 00
3F 6F 02
00 00 00 00 00 00 00 01 00
6C 0D A7
00 00 00 00 00 00 00 00 01
0E 38 40
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Calculation of the three parity bytes using the generator matrix method is summarized in the following formulas:
c = m × G (B.8)
where the arithmetic is done in GF(2
8
), with:
m = (m
K-1
, m
K-2
, ... m
0
) (B.9)
c = (m
K-1
, m
K-2
, ... m
0
, p
2
, p
1
, p
0
) (B.10)
where:
• m = message vector of K octets where K = 9;
• G = generator matrix, K rows by N columns;
• c = code word vector of N octets where N = 12.
The elements in GF(2
8
) can be expressed in two ways, either as a polynomial in α with degree 7 or less, or as an
exponent of
α where the exponent is in the range 0 to 254 decimal.
NOTE 2: The zero element of the field does not have an exponential representation, so exponents only range up to
254 decimal.
Arithmetic in GF(2
8
) consists of addition and multiplication. Addition is easy for the polynomial form since each term
adds, modulo 2. Addition is hard for the exponent form since the exponent form must be converted to a polynomial for
addition and converted back to an exponent. Multiplication is easy for the exponent form since the exponents add
modulo 255. Multiplication is harder for the polynomial form, since the polynomials have to be multiplied to yield a
higher degree polynomial, and this has to be reduced to a residue modulo:
α
8
+ α
4
+ α
3
+ α
2
+ 1 (B.11)
with
α
e
= b
7
α
7
+ b
6
α
6
+ ... b
1
α + b
0
(B.12)
where:
• e = exponent expressed in decimal radix;
• b = hexadecimal representation of bits (b
7
, b
6
, ... b
1
, b
0
).
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These operations can be performed using the exponential and logarithm lookup tables B.19 and B.20. In these tables the
exponents are given as decimal numbers and the polynomials are expressed as hexadecimal numbers.
Table B.19 is a table of polynomials that can be used to transform exponentials to polynomials.
Table B.19: Exponential table: B = α
E
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
0 1 2 4 8 10 20 40 80 1D 3A 74 E8 CD 87 13 26
16 4C 98 2D 5A B4 75 EA C9 8F 03 06 0C 18 30 60 C0
32 9D 27 4E 9C 25 4A 94 35 6A D4 B5 77 EE C1 9F 23
48 46 8C 05 0A 14 28 50 A0 5D BA 69 D2 B9 6F DE A1
64 5F BE 61 C2 99 2F 5E BC 65 CA 89 0F 1E 3C 78 F0
80 FD E7 D3 BB 6B D6 B1 7F FE E1 DF A3 5B B6 71 E2
96 D9 AF 43 86 11 22 44 88 0D 1A 34 68 D0 BD 67 CE
112
81 1F 3E 7C F8 ED C7 93 3B 76 EC C5 97 33 66 CC
128
85 17 2E 5C B8 6D DA A9 4F 9E 21 42 84 15 2A 54
144
A8 4D 9A 29 52 A4 55 AA 49 92 39 72 E4 D5 B7 73
160
E6 D1 BF 63 C6 91 3F 7E FC E5 D7 B3 7B F6 F1 FF
176
E3 DB AB 4B 96 31 62 C4 95 37 6E DC A5 57 AE 41
192
82 19 32 64 C8 8D 07 0E 1C 38 70 E0 DD A7 53 A6
208
51 A2 59 B2 79 F2 F9 EF C3 9B 2B 56 AC 45 8A 09
224
12 24 48 90 3D 7A F4 F5 F7 F3 FB EB CB 8B 0B 16
240
2C 58 B0 7D FA E9 CF 83 1B 36 6C D8 AD 47 8E 01
Table B.20 is a table of exponentials that can be used to transform polynomials to exponentials.
Table B .20: Log table: E = LOG(B)
0 1 2 3 4 5 6 7 8 9 A B C D E F
00
--
0 1 25 2 50 26 198 3 223 51 238 27 104 199 75
10 4 100 224 14 52 141 239 129 28 193 105 248 200 8 76 113
20 5 138 101 47 225 36 15 33 53 147 142 218 240 18 130 69
30 29 181 194 125 106 39 249 185 201 154 9 120 77 228 114 166
40 6 191 139 98 102 221 48 253 226 152 37 179 16 145 34 136
50 54 208 148 206 143 150 219 189 241 210 19 92 131 56 70 64
60 30 66 182 163 195 72 126 110 107 58 40 84 250 133 186 61
70 202 94 155 159 10 21 121 43 78 212 229 172 115 243 167 87
80 7 112 192 247 140 128 99 13 103 74 222 237 49 197 254 24
90 227 165 153 119 38 184 180 124 17 68 146 217 35 32 137 46
A0
55 63 209 91 149 188 207 205 144 135 151 178 220 252 190 97
B0
242 86 211 171 20 42 93 158 132 60 57 83 71 109 65 162
C0
31 45 67 216 183 123 164 118 196 23 73 236 127 12 111 246
D0
108 161 59 82 41 157 85 170 251 96 134 177 187 204 62 90
E0
203 89 95 176 156 169 160 81 11 245 22 235 122 117 44 215
F0 79 174 213 233 230 231 173 232 116 214 244 234 168 80 88 175
B.3.7 8-bit CRC calculation
The 8-bit parity field for both the 4-burst CACH Short LC message and the Hash Address information element of the
Activity Update Short LC message shall be an 8-bit CRC. It shall be the remainder of the division (modulo 2) by the
generator polynomial:
G
8
(x) = x
8
+ x
2
+ x + 1 (B.13)
of the product of x
8
multiplied by the content of the data polynomial M(x). For the 8-bit CRC calculation there is no
inversion polynomial and the initial remainder shall be 00000000
2
.
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For the Short LC, consider the 28 bits (SLCO and Data information elements as defined in clause 7.1 of the present
document) as the message polynomial, M(x), of degree 27, with:
• bit 3 of octet 0 corresponding to the x
27
term;
• bit 2 of octet 0 corresponding to the x
26
term; etc.
• bit 1 of octet 3 corresponding to the x
1
term;
• bit 0 of octet 3 corresponding to the x
0
term.
For the Hash ID information element consider the 24 bits of the destination address as the message polynomial, M(x),
of degree 23, with:
• MSB of destination address corresponding to the x
23
term; etc.
• LSB of destination address corresponding to the x
0
term;
NOTE: Hash ID information element is defined in TS 102 361-2 [5].
The 8-bit CRC polynomial, F
8
(x), shall be computed from the formula:
F
8
(x) = x
8
M(x) mod G
8
(x) (B.14)
modulo 2, i.e. in GF(2).
For the Short LC the coefficients of F
8
(x) are placed in the CRC field with the MSB of the CRC corresponding to x
7
and the LSB of the CRC corresponding x
0
. For the Hash ID information element the MSB of the CRC corresponds to
the MSB of the Hash ID and the LSB of the CRC corresponds to the LSB of the Hash ID.
B.3.8 CRC-CCITT calculation
Consider the n data bits as the coefficients of a polynomial M(x) of degree n-1, associating the MSB of the zero-th octet
with x
n-1
and the LSB of the last octet with x
0
. Define the generator polynomial, G
H
(x), and the inversion polynomial,
I
H
(x).
G
H
(x) = x
16
+ x
12
+ x
5
+ 1 (B.15)
I
H
(x) = x
15
+ x
14
+ x
13
+ ... + x
2
+ x + 1 (B.16)
The CRC polynomial, F
H
(x), is then computed from the formula:
F
H
(x) = (x
16
M(x) mod G
H
(x)) + I
H
(x) (B.17)
modulo 2, i.e. in GF(2).
The coefficients of F
H
(x) are placed in the CRC field with the MSB of the zero-th octet of the CRC corresponding to
x
15
and the LSB of the next octet of the CRC corresponding to x
0
. For the CRC-CCITT calculation the initial remainder
shall be 0000
16
.
B.3.9 32-bit CRC calculation
The message CRC is a 4-octet cyclic redundancy check coded over all of the user data and pad octets included in the
Intermediate Blocks and the Last Block. The message CRC does not include the Data Block Serial Number or the Block
9-bit CRC. The specific calculation is as follows:
The user data and pad bits begin as an arrangement of 16-bit words as illustrated in figure B.8AA. Each 16-bit word
comprises a Most Significant Octet (MSO) and a Least Significant Octet (LSO).
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Word 0
Word 1
Word 2
Word ( k/16 – 1)
Word ( k/16 – 2)
Most Significant Octet
(MSO)
Least Significant Octet
(LSO)
MSB
LSB
MSB
LSB
Word 0
Word 1
Word 2
Word (
Word 0
Word 1
Word 2
Word ( k/16 – 1)
Word ( k/16 – 2)
Most Significant Octet
(MSO)
Least Significant Octet
(LSO)
MSB
LSB
MSB
LSB
Figure B.8AA: User data and pad octes arranged as 16-bit words
The first octet of user data (8-bit character) shall be loaded into the MSO of Word 0, then the second octet of user data
shall be loaded into the LSO of Word 0. The third octet of user data shall be loaded into the MSO of Word 1 and this
continues until the LSO of Word k/16 - 1 is loaded last.
Let k be the total number of user data and pad bits over which the message CRC is to be calculated. To compute the
32-bit CRC, the 16-bit words are arranged linearly using the following format, where the least significant octet of a
word appears before the most significant octet of the same word. This is illustrated in figure B.8B.
Octet 0
Octet 1
Octet 2
Octet 3
Octet 4
Octet 5
Octet (k/8 – 1)
Octet (k/8 – 2)
Octet (k/8 – 3)
Octet (k/8 – 4)
Octet (k/8 – 5)
Octet (k/8 – 6)
Word 0 MSO
Word 0 LSO
Word 1 MSO
Word 1 LSO
Word 2 MSO
Word 2 LSO
Word k/16 - 1 MSO
Word k/16 - 1 LSO
Word k/16 - 2 MSO
Word k/16 - 2 LSO
Word k/16 - 3 MSO
Word k/16 - 3 LSO
MSB
LSB
b
k-9
b
k-1
b
k-25
b
k-8
b
k-16
b
k-17
b
k-41
b
k-33
b
47
b
40
b
39
b
31
b
23
b
15
b
7
b
8
b
0
b
24
b
16
b
32
b
k-32
b
k-24
b
k-48
b
k-40
Octet 0
Octet 1
Octet 2
Octet 3
Octet 4
Octet 5
Octet (k/8 – 1)
Octet (k/8 – 2)
Octet (k/8 – 3)
Octet (k/8 – 4)
Octet (k/8 – 5)
Octet (k/8 – 6)
Word 0 MSO
Word 0 LSO
Word 1 MSO
Word 1 LSO
Word 2 MSO
Word 2 LSO
Word k/16 - 1 MSO
Word k/16 - 1 LSO
Word k/16 - 2 MSO
Word k/16 - 2 LSO
Word k/16 - 3 MSO
Word k/16 - 3 LSO
MSB
LSB
b
k-9
b
k-1
b
k-25
b
k-8
b
k-16
b
k-17
b
k-41
b
k-33
b
47
b
40
b
39
b
31
b
23
b
15
b
7
b
8
b
0
b
24
b
16
b
32
b
k-32
b
k-24
b
k-48
b
k-40
Figure B.8B: User data and pad octets arranged as 8-bit words in linear format
Now, consider the k message bits as the coefficients of a polynomial M(x) of degree k-1, associating the MSB of the
zero-th octet with x
k-1
and the LSB of the last octet with x
0
. Define the generator polynomial, G
M
(x)
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G
M
(x) = x
32
+ x
26
+ x
23
+ x
22
+ x
16
+ x
12
+ x
11
+ x
10
+ x
8
+ x
7
+ x
5
+ x
4
+ x
2
+ x + 1 (B.18)
The message CRC polynomial, F
M
(x), is then computed from the following formula:
F
M
(x) = x
32
M(x) mod G
M
(x) (B.19)
modulo 2, i.e. in GF(2). For the 32-bit CRC calculation the initial remainder shall be 00000000
16
.
The coefficients of F
M
(x) are placed in the CRC field with the MSB of the 3
rd
octet of the CRC (i.e., the least
significant CRC octet) corresponding to x
31
, the MSB of the 2
nd
octet of the CRC corresponding to x
23
, the MSB of the
1
st
octet of the CRC corresponding to x
15
, and the MSB of the 0
th
octet of the CRC (i.e., the most significant CRC
octet) corresponding to x
7
. This ordering of CRC octets, where less significant octets appear before more significant
octets, is shown in figure B.8C.
b
23
b
31
b
7
b
15
CRC 3
rd
Octet
CRC 2
nd
Octet
CRC 1
st
Octet
CRC 0
th
Octet
MSB
LSB
b
0
b
8
b
16
b
24
b
23
b
31
b
7
b
15
CRC 3
rd
Octet
CRC 2
nd
Octet
CRC 1
st
Octet
CRC 0
th
Octet
MSB
LSB
b
0
b
8
b
16
b
24
Figure B.8C: Ordering of CRC octets
B.3.10 CRC-9 calculation
For confirmed data blocks the transmitter computes the CRC-9 as follows. First, the block data and the seven bits of the
serial number are arranged as a sequence of bits, with the serial number being the last seven bits. For a non-last data
block the block data is the user data. For a last data block the block data is the user data and the message CRC. The
CRC-9 calculation applies to the following block data sizes.
Rate ½ coded confirmed (10 data octets): 80 bit sequence.
Rate ¾ coded confirmed (16 data octets): 128 bit sequence.
Rate 1 coded confirmed (22 data octets): 176 bit sequence.
The naming convention of the block data bits for a Rate ¾ coded confirmed data block is illustrated in figure B.8D.
7 6 5 4 3 2 1 0
0
1
2
3
4
5
11
14
15
Octet
Rate ¾ coded
confirmed
non-last data block
user data
Octet
7 6 5 4 3 2 1 0
0
1
2
3
4
5
14
Message CRC
15
Rate ¾ coded
confirmed
last data block
user data
13
12
11
etc.
12
13
etc.
7 6 5 4 3 2 1 0
0
1
2
3
4
5
11
14
15
Octet
Rate ¾ coded
confirmed
non-last data block
user data
Octet
7 6 5 4 3 2 1 0
0
1
2
3
4
5
14
Message CRC
15
Rate ¾ coded
confirmed
last data block
user data
13
12
11
etc.
12
13
etc.
Figure B.8D: Rate ¾ coded confirmed user data bit numbering
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The sequence of bits is then considered to be the coefficients of a message polynomial, M(x). M(x) will be of degree
134 for rate ¾ coded confirmed data blocks and M(x) will be of degree 86 for rate ½ coded confirmed data blocks and
M(x) will be of degree 182 for rate 1 coded confirmed data blocks. For example M(x) for the rate ¾ coded confirmed
data block case is:
• bit 7 of block data octet 0 corresponding to a coefficient of the x
134
term;
• bit 6 of block data octet 0 corresponding to the x
133
term;
• etc.
• bit 1 of block data octet 15 corresponding to the x
8
term;
• bit 0 of block data octet 15 corresponding to the x
7
term;
• bit 6 of the Serial Number corresponding to the x
6
term;
• bit 5 of the Serial Number corresponding to the x
5
term;
• etc.
• bit 1 of the Serial Number corresponding to the x
1
term;
• bit 0 of the Serial Number corresponding to the x
0
term;
Define the generator polynomial, G
9
(x), and the inversion polynomial, I
9
(x):
G
9
(x) = x
9
+ x
6
+ x
4
+ x
3
+ 1 (B.20)
I
9
(x) = x
8
+ x
7
+ x
6
+ ...+ x + 1 (B.21)
The CRC-9 polynomial, F
9
(x), shall be computed from the formula:
F
9
(x) = (x
9
M(x) mod G
9
(x)) + I
9
(x) (B.22)
modulo 2, i.e. in GF(2).
The coefficients of F
9
(x) are placed in the CRC-9 field as illustrated in figure 8.12 of the present document with the
MSB corresponding to bit 0 of octet 0, the next most significant bit corresponding to bit 7 of octet 1, and the LSB
corresponding to bit 0 of octet 1. For the CRC-9 calculation the initial remainder shall be 000000000
2
.
B.3.11 5-bit Checksum (CS) calculation
The calculation for the 5-bit CS is given by formula (B.23), where the summation is done with unsigned arithmetic in a
16-bit accumulator (maximum value is 9 × 255 = 2 295) where the values for LC_x are the octets of the 72-bit LC as
shown in figure B.3. The calculation yields a 5-bit CS in the range 0 to 30.
CS = [LC_0 + LC_1 + ... + LC_8] mod 31 (B.23)
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B.3.12 Data Type CRC Mask
A unique Data Type CRC Mask shall be applied to the entire CRC portion of the data or control burst information
contents and is defined in table B.21. For transmission, the CRC mask shall be applied after the CRC calculation and
before the FEC encoding. Application shall involve the exclusive-or operation of the calculated CRC and the CRC
mask and then replacement of the calculated CRC with the exclusive-or result. For reception, the CRC mask shall be
applied after the FEC decoding and before the CRC check. Application shall involve the exclusive-or operation of the
received CRC and the CRC mask and replacement of the received CRC with the exclusive-or result. Use of the same
mask at both transmission and reception results in the original calculated CRC at the receiver. Use of different masks
results in a receiver CRC failure.
Table B.21: Data Type CRC Mask
Data Type CRC mask
PI Header
6969
16
Voice LC Header
969696
16
Terminator with LC
999999
16
CSBK
A5A5
16
MBC Header
AAAA
16
MBC Continuation, see note 1 -
Data Header
CCCC
16
Rate ½ Data, see note 2
0FO
16
Rate ¾ Data, see note 2
1FF
16
Rate 1 Data, see note 2
10F
16
Idle, see note 1 -
NOTE 1: Not required.
NOTE 2: Only used when CRC-9 present in burst.
The CRC mask values in table B.21 were selected for the appropriate CRC length from the values found in table B.22.
Future values are to be selected from table B.22 so the minimum distance between CRC masks is preserved.
NOTE: The 9 bit CRC Mask values shown in table B.22 are shown in hexadecimal form. The 9 bit CRC Mask is
composed of the 9 LSBs of the 12 bit value.
Table B.22: CRC Mask
Index 8 bit CRC 9 bit CRC 16 bit CRC 24 bit CRC 32 bit CRC
0
69
16
169
16
6969
16
696969
16
69696969
16
1
96
16
096
16
9696
16
969696
16
96969696
16
2
99
16
199
16
9999
16
999999
16
99999999
16
3
A5
16
1A5
16
A5A5
16
A5A5A5
16
A5A5A5A5
16
4
AA
16
0AA
16
AAAA
16
AAAAAA
16
AAAAAAAA
16
5
C3
16
1C3
16
C3C3
16
C3C3C3
16
C3C3C3C3
16
6
CC
16
0CC
16
CCCC
16
CCCCCC
16
CCCCCCCC
16
7
F0
16
0F0
16
F0F0
16
F0F0F0
16
F0F0F0F0
16
8
FF
16
1FF
16
FFFF
16
FFFFFF
16
FFFFFFFF
16
9
00
16
000
16
0000
16
000000
16
00000000
16
10
0F
16
10F
16
0F0F
16
0F0F0F
16
0F0F0F0F
16
11
33
16
133
16
3333
16
333333
16
33333333
16
12
3C
16
03C
16
3C3C
16
3C3C3C
16
3C3C3C3C
16
13
55
16
155
16
5555
16
555555
16
55555555
16
14
5A
16
05A
16
5A5A
16
5A5A5A
16
5A5A5A5A
16
15
66
16
066
16
6666
16
666666
16
66666666
16
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B.4 Interleaving
B.4.1 CACH interleaving
The details for interleaving the payload and CACH framing over a 24-bit CACH burst are shown in figure B.9. The
access (AT), numbering (TC), and framing bits (LCSS) and their three Hamming parity bits (H) are spread over the
entire CACH burst for resistance to fades. The seventeen CACH payload bits (P) placed sequentially in the gaps.
AT TC LS(1) LS(0) H(2) H(1) H(0) P(16) P(15) P(14) P(13) P(12) P(11) P(10) P(9) P(8) P(7) P(6) P(5) P(4) P(3) P(2) P(1) P(0)
AT TC LS(1) P(8) P(6) P(3) P(0)P(16) P(15) P(14) P(13) P(12) P(11) P(10) P(9) LS(0) P(7) H(2) P(5) P(4) H(1) P(2) P(1) H(0)
TX(23) TX(22) TX(21) TX(20) TX(19) TX(18) TX(17) TX(16) TX(15) TX(14) TX(13) TX(12) TX(11) TX(10) TX(9) TX(8) TX(7) TX(6) TX(5) TX(4) TX(3) TX(2) TX(1) TX(0)
AT TC LS(1) LS(0) H(2) H(1) H(0)ATAT TCTC LS(1)LS(1) LS(0)LS(0) H(2)H(2) H(1)H(1) H(0)H(0) P(16) P(15) P(14) P(13) P(12) P(11) P(10) P(9) P(8) P(7) P(6) P(5) P(4) P(3) P(2) P(1) P(0)P(16) P(15) P(14) P(13) P(12) P(11) P(10) P(9) P(8) P(7) P(6) P(5) P(4) P(3) P(2) P(1) P(0)
ATAT TCTC LS(1)LS(1) P(8)P(8) P(6)P(6) P(3)P(3) P(0)P(0)P(16) P(15) P(14)P(16)P(16) P(15)P(15) P(14)P(14) P(13) P(12) P(11)P(13)P(13) P(12)P(12) P(11)P(11) P(10) P(9)P(10)P(10) P(9)P(9) LS(0) P(7) H(2)LS(0)LS(0) P(7)P(7) H(2)H(2) P(5) P(4) H(1)P(5)P(5) P(4)P(4) H(1)H(1) P(2) P(1) H(0)P(2)P(2) P(1)P(1) H(0)H(0)
TX(23) TX(22) TX(21) TX(20) TX(19) TX(18) TX(17) TX(16) TX(15) TX(14) TX(13) TX(12) TX(11) TX(10) TX(9) TX(8) TX(7) TX(6) TX(5) TX(4) TX(3) TX(2) TX(1) TX(0)
Figure B.9: CACH burst interleaver
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Annex C (informative):
Example timing diagrams
This annex describes and shows some timing examples.
C.1 Direct mode timing
In this case a mobile station transmits a Normal Burst in Slot 1 and then listens for a RC burst in Slot 2. Alternatively,
the mobile station transmits a Normal Burst in Slot 2 and listens for a RC Burst in Slot 1; the timing is the same either
way. The timing is shown in figure C.1.
Tx Rx Tx
5 ms 8,75 ms 1,5 ms1,5 ms 9,75 ms
1 ms
Propagation
Allowance
Slot Center Slot Center
30 ms30 ms
13,75 ms13,75 ms
Slot Center
5 ms
Tx Rx Tx
5 ms 8,75 ms 1,5 ms1,5 ms 9,75 ms
1 ms
Propagation
Allowance
Slot Center Slot Center
30 ms30 ms
13,75 ms13,75 ms
Slot Center
5 ms
Figure C.1: Direct mode timing diagram
The case shown in figure C.1 is that of a mobile station transmitting in direct mode and then listening for a RC
transmission from a second mobile station. Since the second mobile station can be a substantial distance from the first
mobile station, its RC burst can be delayed with respect to the slotting structure defined by the first mobile station. By
specification, the delay can be up to 1 ms. This means that the first mobile station shall be ready to receive the RC
9,75 ms after sending its Normal Burst but may change frequency to transmit no sooner than 8,75 ms before its next
Normal Burst is to be sent. Therefore, in this case, the maximum synthesizer lock-time shall be 8,75 ms.
C.2 Reverse Channel timing
This example shows a mobile station transmitting on a RC burst between receiving Normal Bursts from a second base
or mobile station. In this case, the mobile station synchronizes its timing to the second station, regardless of whether the
second station is a base or mobile, and, therefore, there is no timing offset due to propagation delay. The timing is
shown in figure C.2. The maximum allowable synthesizer lock-time shall be 8,75 ms.
Tx
2,5 ms2,5 ms
Rx Rx
6,25 ms
Slot Center Slot Center
30 ms30 ms
5 ms
5 ms
Slot Center
13,75 ms13,75 ms
15 ms
Slot
Boundary
= CACH= CACH
15 ms
6,25 ms
Slot
Boundary
Tx
2,5 ms2,5 ms
Rx Rx
6,25 ms
Slot Center Slot Center
30 ms30 ms
5 ms
5 ms
Slot Center
13,75 ms13,75 ms
15 ms
Slot
Boundary
= CACH= CACH
15 ms
6,25 ms
Slot
Boundary
= CACH= CACH
15 ms
6,25 ms
Slot
Boundary
Figure C.2: Reverse Channel timing diagram
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Annex D (normative):
Idle and Null message bit definition
The following abbreviations are used in the tables:
H_Cx Hamming parity bit from column x of a BPTC;
H_Rx Hamming parity bit from row x of a BPTC;
I Information bit;
R Reserved bit;
TX Transmitted bit.
D.1 Null embedded message bit definitions
The 11 information bits of the Null embedded message are all set to 0. Consequently, all of the FEC and parity check
bits of the BPTC will also be 0. The 32 bits of the Transmit Matrix defined in clause B.2.1 are listed in table D.1.
Table D.1: Null embedded signalling
Bit index Bit value Bit index Bit value Bit index Bit value Bit index Bit value
TX(31) 0 TX(23) 0 TX(15) 0 TX(7) 0
TX(30) 0 TX(22) 0 TX(14) 0 TX(6) 0
TX(29) 0 TX(21) 0 TX(13) 0 TX(5) 0
TX(28) 0 TX(20) 0 TX(12) 0 TX(4) 0
TX(27) 0 TX(19) 0 TX(11) 0 TX(3) 0
TX(26) 0 TX(18) 0 TX(10) 0 TX(2) 0
TX(25) 0 TX(17) 0 TX(9) 0 TX(1) 0
TX(24) 0 TX(16) 0 TX(8) 0 TX(0) 0
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D.2 Idle message bit definitions
The information bits for the Idle message are creating by generating 96 bits of pseudo random bits. The specific values
of these bits are given in table D.2.
Table D.2: Information bits for Idle message
Bit name Bit value Bit name Bit value Bit name Bit value Bit name Bit value
I(95) 1 I(71) 0 I(47) 0 I(23) 1
I(94) 1 I(70) 0 I(46) 1 I(22) 1
I(93) 1 I(69) 0 I(45) 0 I(21) 0
I(92) 1 I(68) 1 I(44) 0 I(20) 0
I(91) 1 I(67) 0 I(43) 1 I(19) 1
I(90) 1 I(66) 1 I(42) 1 I(18) 1
I(89) 1 I(65) 1 I(41) 1 I(17) 0
I(88) 1 I(64) 1 I(40) 0 I(16) 1
I(87) 1 I(63) 0 I(39) 1 I(15) 1
I(86) 0 I(62) 0 I(38) 1 I(14) 0
I(85) 0 I(61) 1 I(37) 0 I(13) 0
I(84) 0 I(60) 1 I(36) 1 I(12) 0
I(83) 0 I(59) 0 I(35) 0 I(11) 1
I(82) 0 I(58) 0 I(34) 0 I(10) 0
I(81) 1 I(57) 1 I(33) 0 I(9) 1
I(80) 1 I(56) 0 I(32) 1 I(8) 0
I(79) 1 I(55) 0 I(31) 1 I(7) 1
I(78) 1 I(54) 0 I(30) 1 I(6) 0
I(77) 0 I(53) 0 I(29) 1 I(5) 0
I(76) 1 I(52) 0 I(28) 0 I(4) 1
I(75) 1 I(51) 1 I(27) 0 I(3) 0
I(74) 1 I(50) 0 I(26) 1 I(2) 0
I(73) 1 I(49) 0 I(25) 1 I(1) 0
I(72) 1 I(48) 1 I(24) 1 I(0) 1
The information bits are then FEC encoded using the BPTC (196,96) defined in clause B.1.1 and interleaved for the
general data burst. The information bits and FEC parity check bits after encoding are shown in figure D.1 which follows
the format defined in figure B.1.
0 0 0 1 1 1 1 1 1 1 1
0 1 0 0
1 0 0 0 0 0 1 1 1 1 0
1 1 0 1
1 1 1 1 1 0 0 0 1 0 1
1 1 0 1
1 1 0 0 1 1 0 0 1 0 0
0 1 0 1
0 0 0 1 0 0 1 0 1 0 0
0 1 1 1
1 1 1 0 1 1 0 1 0 0 0
1 1 0 1
1 1 1 1 0 0 1 1 1 1 1
0 0 1 0
0 0 1 1 0 1 1 0 0 0 1
1 1 0 1
0 1 0 1 0 0 1 0 0 0 1
0 1 0 1
0 1 0 0 1 1 1 0 0 1 0 0 0 1 1
1 0 1 1 0 0 1 1 1 1 0 1 1 0 0
0 0 1 0 0 0 0 1 0 0 0 0 1 0 0
0 1 0 0 1 0 1 0 1 1 1 0 1 1 0
Figure D.1: FEC encoded Idle message
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The specific bit names and their corresponding bit values for the information and FEC parity bits are listed in table D.3.
Table D.3: FEC encoded bits for Idlemessage
Bit name Bit value Bit name Bit value Bit name Bit value Bit name Bit value
R(3) 0 I(62) 0 I(25) 1 H_C12(3) 0
R(2) 0 I(61) 1 I(24) 1 H_C13(3) 0
R(1) 0 I(60) 1 I(23) 1 H_C14(3) 1
R(0) 0 I(59) 0 I(22) 1 H_C15(3) 1
I(95) 1 I(58) 0 H_R7(3) 0 H_C1(2) 1
I(94) 1 I(57) 1 H_R7(2) 0 H_C2(2) 0
I(93) 1 I(56) 0 H_R7(1) 1 H_C3(2) 1
I(92) 1 I(55) 0 H_R7(0) 0 H_C4(2) 1
I(91) 1 H_R4(3) 0 I(21) 0 H_C5(2) 0
I(90) 1 H_R4(2) 1 I(20) 0 H_C6(2) 0
I(89) 1 H_R4(1) 0 I(19) 1 H_C7(2) 1
I(88) 1 H_R4(0) 1 I(18) 1 H_C8(2) 1
H_R1(3) 0 I(54) 0 I(17) 0 H_C9(2) 1
H_R1(2) 1 I(53) 0 I(16) 1 H_C10(2) 1
H_R1(1) 0 I(52) 0 I(15) 1 H_C11(2) 0
H_R1(0) 0 I(51) 1 I(14) 0 H_C12(2) 1
I(87) 1 I(50) 0 I(13) 0 H_C13(2) 1
I(86) 0 I(49) 0 I(12) 0 H_C14(2) 0
I(85) 0 I(48) 1 I(11) 1 H_C15(2) 0
I(84) 0 I(47) 0 H_R8(3) 1 H_C1(1) 0
I(83) 0 I(46) 1 H_R8(2) 1 H_C2(1) 0
I(82) 0 I(45) 0 H_R8(1) 0 H_C3(1) 1
I(81) 1 I(44) 0 H_R8(0) 1 H_C4(1) 0
I(80) 1 H_R5(3) 0 I(10) 0 H_C5(1) 0
I(79) 1 H_R5(2) 1 I(9) 1 H_C6(1) 0
I(78) 1 H_R5(1) 1 I(8) 0 H_C7(1) 0
I(77) 0 H_R5(0) 1 I(7) 1 H_C8(1) 1
H_R2(3) 1 I(43) 1 I(6) 0 H_C9(1) 0
H_R2(2) 1 I(42) 1 I(5) 0 H_C10(1) 0
H_R2(1) 0 I(41) 1 I(4) 1 H_C11(1) 0
H_R2(0) 1 I(40) 0 I(3) 0 H_C12(1) 0
I(76) 1 I(39) 1 I(2) 0 H_C13(1) 1
I(75) 1 I(38) 1 I(1) 0 H_C14(1) 0
I(74) 1 I(37) 0 I(0) 1 H_C15(1) 0
I(73) 1 I(36) 1 H_R9(3) 0 H_C1(0) 0
I(72) 1 I(35) 0 H_R9(2) 1 H_C2(0) 1
I(71) 0 I(34) 0 H_R9(1) 0 H_C3(0) 0
I(70) 0 I(33) 0 H_R9(0) 1 H_C4(0) 0
I(69) 0 H_R6(3) 1 H_C1(3) 0 H_C5(0) 1
I(68) 1 H_R6(2) 1 H_C2(3) 1 H_C6(0) 0
I(67) 0 H_R6(1) 0 H_C3(3) 0 H_C7(0) 1
I(66) 1 H_R6(0) 1 H_C4(3) 0 H_C8(0) 0
H_R3(3) 1 I(32) 1 H_C5(3) 1 H_C9(0) 1
H_R3(2) 1 I(31) 1 H_C6(3) 1 H_C10(0) 1
H_R3(1) 0 I(30) 1 H_C7(3) 1 H_C11(0) 1
H_R3(0) 1 I(29) 1 H_C8(3) 0 H_C12(0) 0
I(65) 1 I(28) 0 H_C9(3) 0 H_C13(0) 1
I(64) 1 I(27) 0 H_C10(3) 1 H_C14(0) 1
I(63) 0 I(26) 1 H_C11(3) 0 H_C15(0) 0
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Annex E (normative):
Transmit bit order
Tables E.1 to E.12 list out the transmit order of bits for the basic data and voice bursts. The transmitter modulation
consists of a sequence of dibit symbols that are serially transmitted. Each dibit consists of 2 bits of information. The
tables for the bursts consist of a sequence of dibit symbols, starting with symbol L66 (66 symbols to the left of burst
centre), decrementing to L1, then proceeding with R1, and then incrementing up to R66 (66 symbols to the right of
burst centre). The first symbol transmitted shall be symbol L66.
The transmitted signal consists of a sequence of fields of information. Each field is in turn decomposed into bits. For
example, the voice code word 0, or c_0, consists of 24 bits which are numbered 23, 22, 21, ... 1, 0. The least significant
bit is always numbered 0 in a field. Generally, the least significant bit is always transmitted last. The least significant bit
is always portrayed as the right-most bit. The number of the bit is always enclosed in parenthesis, for example
HC_12(1) refers to the vector for the Hamming code word for the 12
th
column, first bit.
After most of the information fields there is a parity check field for the error correcting code. The name of the code is
always used to denote the parity check field. For example, a QR code is used to protect the embedded code word
(EMB), so the parity check field is named qr(x) where x varies from 8 down to 0. Bit 0 is always the least significant bit
of the parity check field, and is always portrayed as the right-most bit. In most cases, an index number for a bit follows
the field name, as in "H_C11(3)", which denotes bit 3 of the field.
The following abbreviations are used in the tables:
CC Colour Code;
D_Sync General Data Burst Sync;
DT Data Type field for General Data Bursts;
Golay Golay Code parity check;
H_Cx Hamming parity bit from column x of a BPTC;
H_Rx Hamming parity bit from row x of a BPTC;
Hx Hamming parity bit for row x of a BPTC;
I Information bit for General Data Burst payload;
LCSS Link Control Start/ Stop;
N_LC Null LC bit;
PC Parity Check bit;
PI Privacy Indicator;
QR Quadratic Residue Code Parity Check bit;
R Reserved bit;
R_Sync Reverse Channel Sync;
RC Reverse Channel information bit;
Trellis_Dibit Output Dibit from Trellis C ode;
V_Sync TDMA Voice Burst Sync;
VS Vocoder Socket bit.
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Table E.1: Transmit bit order for BPTC general data burst with SYNC
Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0
L66
R(3) H_R1(2)
L22
H_C14(2) H_C12(1)
R23
I(75) H_R3(0)
L65
I(77) I(68)
L21
H_C10(0) I(92)
R24
H_R4(2) I(44)
L64
I(59) I(50)
L20
I(83) I(74)
R25
I(35) I(26)
L63
I(41) I(32)
L19
I(65) H_R4(1)
R26
I(17) I(8)
L62
H_R7(1) H_R8(3)
L18
H_R5(3) I(34)
R27
H_C1(3) H_C14(3)
L61
I(1) H_C8(3)
L17 CC(3) CC(2) R28
H_C12(2) H_C10(1)
L60
H_C6(2) H_C4(1)
L16 CC(1) CC(0) R29
H_C8(0) I(94)
L59
H_C2(0) H_C15(0)
L15 DT (3) DT (2) R30
I(85) I(76)
L58
H_R1(3) I(78)
L14 DT (1) DT (0) R31
H_R3(1) H_R4(3)
L57
I(69) I(60)
L13 Golay(11) Golay(10) R32
I(45) I(36)
L56
I(51) I(42)
L12 D_Sync(47) D_Sync(46) R33
I(27) I(18)
L55
H_R6(0) H_R7(2)
L11 D_Sync(45) D_Sync(44) R34
I(9) H_R9(0)
L54
I(11) I(2)
L10 D_Sync(43) D_Sync(42) R35
H_C13(3) H_C11(2)
L53
H_C7(3) H_C5(2)
L9 D_Sync(41) D_Sync(40) R36
H_C9(1) H_C7(0)
L52
H_C3(1) H_C1(0)
L8 D_Sync(39) D_Sync(38) R37
I(95) I(86)
L51
H_C14(0) I(88)
L7 D_Sync(37) D_Sync(36) R38
H_R2(0) H_R3(2)
L50
I(79) I(70)
L6 D_Sync(35) D_Sync(34) R39
I(55) I(46)
L49
I(61) I(52)
L5 D_Sync(33) D_Sync(32) R40
I(37) I(28)
L48
I(43) H_R6(1)
L4 D_Sync(31) D_Sync(30) R41
I(19) I(10)
L47
H_R7(3) I(12)
L3 D_Sync(29) D_Sync(28) R42
H_R9(1) H_C12(3)
L46
I(3) H_C6(3)
L2 D_Sync(27) D_Sync(26) R43
H_C10(2) H_C8(1)
L45
H_C4(2) H_C2(1)
L1 D_Sync(25) D_Sync(24) R44
H_C6(0) R(0)
L44
H_C15(1) H_C13(0)
R1 D_Sync(23) D_Sync(22) R45
I(87) H_R2(1)
L43
I(89) I(80)
R2 D_Sync(21) D_Sync(20) R46
H_R3(3) I(56)
L42
I(71) I(62)
R3 D_Sync(19) D_Sync(18) R47
I(47) I(38)
L41
I(53) H_R5(0)
R4 D_Sync(17) D_Sync(16) R48
I(29) I(20)
L40
H_R6(2) I(22)
R5 D_Sync(15) D_Sync(14) R49
H_R8(0) H_R9(2)
L39
I(13) I(4)
R6 D_Sync(13) D_Sync(12) R50
H_C11(3) H_C9(2)
L38
H_C5(3) H_C3(2)
R7 D_Sync(11) D_Sync(10) R51
H_C7(1) H_C5(0)
L37
H_C1(1) H_C14(1)
R8 D_Sync(9) D_Sync(8) R52
R(1) H_R1(0)
L36
H_C12(0) I(90)
R9 D_Sync(7) D_Sync(6) R53
H_R2(2) I(66)
L35
I(81) I(72)
R10 D_Sync(5) D_Sync(4) R54
I(57) I(48)
L34
I(63) I(54)
R11 D_Sync(3) D_Sync(2) R55
I(39) I(30)
L33
H_R5(1) H_R6(3)
R12 D_Sync(1) D_Sync(0) R56
I(21) H_R8(1)
L32
I(23) I(14)
R13 Golay(9) Golay(8) R57
H_R9(3) H_C10(3)
L31
I(5) H_C4(3)
R14 Golay(7) Golay(6) R58
H_C8(2) H_C6(1)
L30
H_C2(2) H_C15(2)
R15 Golay(5) Golay(4) R59
H_C4(0) R(2)
L29
H_C13(1) H_C11(0)
R16 Golay(3) Golay(2) R60
H_R1(1) H_R2(3)
L28
I(91) I(82)
R17 Golay(1) Golay(0) R61
I(67) I(58)
L27
I(73) I(64)
R18
I(25) I(16)
R62
I(49) I(40)
L26
H_R4(0) H_R5(2)
R19
I(7) H_C2(3)
R63
I(31) H_R7(0)
L25
I(33) I(24)
R20
H_C15(3) H_C13(2)
R64
H_R8(2) I(0)
L24
I(15) I(6)
R21
H_C11(1) H_C9(0)
R65
H_C9(3) H_C7(2)
L23
H_C3(3) H_C1(2)
R22
I(93) I(84)
R66
H_C5(1) H_C3(0)
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Table E.2: Transmit bit order for BPTC general data burst with RC
Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0
L66
R(3) H_R1(2)
L22
H_C14(2) H_C12(1)
R23
I(75) H_R3(0)
L65
I(77) I(68)
L21
H_C10(0) I(92)
R24
H_R4(2) I(44)
L64
I(59) I(50)
L20
I(83) I(74)
R25
I(35) I(26)
L63
I(41) I(32)
L19
I(65) H_R4(1)
R26
I(17) I(8)
L62
H_R7(1) H_R8(3)
L18
H_R5(3) I(34)
R27
H_C1(3) H_C14(3)
L61
I(1) H_C8(3)
L17 CC(3) CC(2) R28
H_C12(2) H_C10(1)
L60
H_C6(2) H_C4(1)
L16 CC(1) CC(0) R29
H_C8(0) I(94)
L59
H_C2(0) H_C15(0)
L15 DT (3) DT (2) R30
I(85) I(76)
L58
H_R1(3) I(78)
L14 DT (1) DT (0) R31
H_R3(1) H_R4(3)
L57
I(69) I(60)
L13 Golay(11) Golay(10) R32
I(45) I(36)
L56
I(51) I(42)
L12 CC(3) CC(2) R33
I(27) I(18)
L55
H_R6(0) H_R7(2)
L11 CC(1) CC(0) R34
I(9) H_R9(0)
L54
I(11) I(2)
L10 PI LCSS(1) R35
H_C13(3) H_C11(2)
L53
H_C7(3) H_C5(2)
L9 LCSS(0) QR(8) R36
H_C9(1) H_C7(0)
L52
H_C3(1) H_C1(0)
L8 RC(10) PC(7) R37
I(95) I(86)
L51
H_C14(0) I(88)
L7 RC(9) PC(6) R38
H_R2(0) H_R3(2)
L50
I(79) I(70)
L6 RC(8) PC(5) R39
I(55) I(46)
L49
I(61) I(52)
L5 RC(7) PC(4) R40
I(37) I(28)
L48
I(43) H_R6(1)
L4 RC(6) PC(3) R41
I(19) I(10)
L47
H_R7(3) I(12)
L3 RC(5) PC(2) R42
H_R9(1) H_C12(3)
L46
I(3) H_C6(3)
L2 RC(4) PC(1) R43
H_C10(2) H_C8(1)
L45
H_C4(2) H_C2(1)
L1 RC(3) PC(0) R44
H_C6(0) R(0)
L44
H_C15(1) H_C13(0)
R1 RC(2) PC(15) R45
I(87) H_R2(1)
L43
I(89) I(80)
R2 RC(1) PC(14) R46
H_R3(3) I(56)
L42
I(71) I(62)
R3 RC(0) PC(13) R47
I(47) I(38)
L41
I(53) H_R5(0)
R4 H1(4) PC(12) R48
I(29) I(20)
L40
H_R6(2) I(22)
R5 H1(3) PC(11) R49
H_R8(0) H_R9(2)
L39
I(13) I(4)
R6 H1(2) PC(10) R50
H_C11(3) H_C9(2)
L38
H_C5(3) H_C3(2)
R7 H1(1) PC(9) R51
H_C7(1) H_C5(0)
L37
H_C1(1) H_C14(1)
R8 H1(0) PC(8) R52
R(1) H_R1(0)
L36
H_C12(0) I(90)
R9 QR(7) QR(6) R53
H_R2(2) I(66)
L35
I(81) I(72)
R10 QR(5) QR(4) R54
I(57) I(48)
L34
I(63) I(54)
R11 QR(3) QR(2) R55
I(39) I(30)
L33
H_R5(1) H_R6(3)
R12 QR(1) QR(0) R56
I(21) H_R8(1)
L32
I(23) I(14)
R13 Golay(9) Golay(8) R57
H_R9(3) H_C10(3)
L31
I(5) H_C4(3)
R14 Golay(7) Golay(6) R58
H_C8(2) H_C6(1)
L30
H_C2(2) H_C15(2)
R15 Golay(5) Golay(4) R59
H_C4(0) R(2)
L29
H_C13(1) H_C11(0)
R16 Golay(3) Golay(2) R60
H_R1(1) H_R2(3)
L28
I(91) I(82)
R17 Golay(1) Golay(0) R61
I(67) I(58)
L27
I(73) I(64)
R18
I(25) I(16)
R62
I(49) I(40)
L26
H_R4(0) H_R5(2)
R19
I(7) H_C2(3)
R63
I(31) H_R7(0)
L25
I(33) I(24)
R20
H_C15(3) H_C13(2)
R64
H_R8(2) I(0)
L24
I(15) I(6)
R21
H_C11(1) H_C9(0)
R65
H_C9(3) H_C7(2)
L23
H_C3(3) H_C1(2)
R22
I(93) I(84)
R66
H_C5(1) H_C3(0)
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Table E.3: Transmit bit order for rate ¾ data burst with SYNC
Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0
L66 Trellis_Dibit(97) L22 Trellis_Dibit(53) R23 Trellis_Dibit(43)
L65 Trellis_Dibit(96) L21 Trellis_Dibit(52) R24 Trellis_Dibit(42)
L64 Trellis_Dibit(95) L20 Trellis_Dibit(51) R25 Trellis_Dibit(41)
L63 Trellis_Dibit(94) L19 Trellis_Dibit(50) R26 Trellis_Dibit(40)
L62 Trellis_Dibit(93) L18 Trellis_Dibit(49) R27 Trellis_Dibit(39)
L61 Trellis_Dibit(92) L17 CC(3) CC(2) R28 Trellis_Dibit(38)
L60 Trellis_Dibit(91) L16 CC(1) CC(0) R29 Trellis_Dibit(37)
L59 Trellis_Dibit(90) L15 DT (3) DT (2) R30 Trellis_Dibit(36)
L58 Trellis_Dibit(89) L14 DT (1) DT (0) R31 Trellis_Dibit(35)
L57 Trellis_Dibit(88) L13 Golay(11) Golay(10) R32 Trellis_Dibit(34)
L56 Trellis_Dibit(87) L12 D_Sync(47) D_Sync(46) R33 Trellis_Dibit(33)
L55 Trellis_Dibit(86) L11 D_Sync(45) D_Sync(44) R34 Trellis_Dibit(32)
L54 Trellis_Dibit(85) L10 D_Sync(43) D_Sync(42) R35 Trellis_Dibit(31)
L53 Trellis_Dibit(84) L9 D_Sync(41) D_Sync(40) R36 Trellis_Dibit(30)
L52 Trellis_Dibit(83) L8 D_Sync(39) D_Sync(38) R37 Trellis_Dibit(29)
L51 Trellis_Dibit(82) L7 D_Sync(37) D_Sync(36) R38 Trellis_Dibit(28)
L50 Trellis_Dibit(81) L6 D_Sync(35) D_Sync(34) R39 Trellis_Dibit(27)
L49 Trellis_Dibit(80) L5 D_Sync(33) D_Sync(32) R40 Trellis_Dibit(26)
L48 Trellis_Dibit(79) L4 D_Sync(31) D_Sync(30) R41 Trellis_Dibit(25)
L47 Trellis_Dibit(78) L3 D_Sync(29) D_Sync(28) R42 Trellis_Dibit(24)
L46 Trellis_Dibit(77) L2 D_Sync(27) D_Sync(26) R43 Trellis_Dibit(23)
L45 Trellis_Dibit(76) L1 D_Sync(25) D_Sync(24) R44 Trellis_Dibit(22)
L44 Trellis_Dibit(75) R1 D_Sync(23) D_Sync(22) R45 Trellis_Dibit(21)
L43 Trellis_Dibit(74) R2 D_Sync(21) D_Sync(20) R46 Trellis_Dibit(20)
L42 Trellis_Dibit(73) R3 D_Sync(19) D_Sync(18) R47 Trellis_Dibit(19)
L41 Trellis_Dibit(72) R4 D_Sync(17) D_Sync(16) R48 Trellis_Dibit(18)
L40 Trellis_Dibit(71) R5 D_Sync(15) D_Sync(14) R49 Trellis_Dibit(17)
L39 Trellis_Dibit(70) R6 D_Sync(13) D_Sync(12) R50 Trellis_Dibit(16)
L38 Trellis_Dibit(69) R7 D_Sync(11) D_Sync(10) R51 Trellis_Dibit(15)
L37 Trellis_Dibit(68) R8 D_Sync(9) D_Sync(8) R52 Trellis_Dibit(14)
L36 Trellis_Dibit(67) R9 D_Sync(7) D_Sync(6) R53 Trellis_Dibit(13)
L35 Trellis_Dibit(66) R10 D_Sync(5) D_Sync(4) R54 Trellis_Dibit(12)
L34 Trellis_Dibit(65) R11 D_Sync(3) D_Sync(2) R55 Trellis_Dibit(11)
L33 Trellis_Dibit(64) R12 D_Sync(1) D_Sync(0) R56 Trellis_Dibit(10)
L32 Trellis_Dibit(63) R13 Golay(9) Golay(8) R57 Trellis_Dibit(9)
L31 Trellis_Dibit(62) R14 Golay(7) Golay(6) R58 Trellis_Dibit(8)
L30 Trellis_Dibit(61) R15 Golay(5) Golay(4) R59 Trellis_Dibit(7)
L29 Trellis_Dibit(60) R16 Golay(3) Golay(2) R60 Trellis_Dibit(6)
L28 Trellis_Dibit(59) R17 Golay(1) Golay(0) R61 Trellis_Dibit(5)
L27 Trellis_Dibit(58) R18 Trellis_Dibit(48) R62 Trellis_Dibit(4)
L26 Trellis_Dibit(57) R19 Trellis_Dibit(47) R63 Trellis_Dibit(3)
L25 Trellis_Dibit(56) R20 Trellis_Dibit(46) R64 Trellis_Dibit(2)
L24 Trellis_Dibit(55) R21 Trellis_Dibit(45) R65 Trellis_Dibit(1)
L23 Trellis_Dibit(54) R22 Trellis_Dibit(44) R66 Trellis_Dibit(0)
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Table E.4: Transmit bit order for rate ¾ data burst with Reverse Channel
Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0
L66 Trellis_Dibit(97) L22 Trellis_Dibit(53) R23 Trellis_Dibit(43)
L65 Trellis_Dibit(96) L21 Trellis_Dibit(52) R24 Trellis_Dibit(42)
L64 Trellis_Dibit(95) L20 Trellis_Dibit(51) R25 Trellis_Dibit(41)
L63 Trellis_Dibit(94) L19 Trellis_Dibit(50) R26 Trellis_Dibit(40)
L62 Trellis_Dibit(93) L18 Trellis_Dibit(49) R27 Trellis_Dibit(39)
L61 Trellis_Dibit(92) L17 CC(3) CC(2) R28 Trellis_Dibit(38)
L60 Trellis_Dibit(91) L16 CC(1) CC(0) R29 Trellis_Dibit(37)
L59 Trellis_Dibit(90) L15 DT (3) DT (2) R30 Trellis_Dibit(36)
L58 Trellis_Dibit(89) L14 DT (1) DT (0) R31 Trellis_Dibit(35)
L57 Trellis_Dibit(88) L13 Golay(11) Golay(10) R32 Trellis_Dibit(34)
L56 Trellis_Dibit(87) L12 CC(3) CC(2) R33 Trellis_Dibit(33)
L55 Trellis_Dibit(86) L11 CC(1) CC(0) R34 Trellis_Dibit(32)
L54 Trellis_Dibit(85) L10 PI LCSS(1) R35 Trellis_Dibit(31)
L53 Trellis_Dibit(84) L9 LCSS(0) QR(8) R36 Trellis_Dibit(30)
L52 Trellis_Dibit(83) L8 RC(10) PC(7) R37 Trellis_Dibit(29)
L51 Trellis_Dibit(82) L7 RC(9) PC(6) R38 Trellis_Dibit(28)
L50 Trellis_Dibit(81) L6 RC(8) PC(5) R39 Trellis_Dibit(27)
L49 Trellis_Dibit(80) L5 RC(7) PC(4) R40 Trellis_Dibit(26)
L48 Trellis_Dibit(79) L4 RC(6) PC(3) R41 Trellis_Dibit(25)
L47 Trellis_Dibit(78) L3 RC(5) PC(2) R42 Trellis_Dibit(24)
L46 Trellis_Dibit(77) L2 RC(4) PC(1) R43 Trellis_Dibit(23)
L45 Trellis_Dibit(76) L1 RC(3) PC(0) R44 Trellis_Dibit(22)
L44 Trellis_Dibit(75) R1 RC(2) PC(15) R45 Trellis_Dibit(21)
L43 Trellis_Dibit(74) R2 RC(1) PC(14) R46 Trellis_Dibit(20)
L42 Trellis_Dibit(73) R3 RC(0) PC(13) R47 Trellis_Dibit(19)
L41 Trellis_Dibit(72) R4 H1(4) PC(12) R48 Trellis_Dibit(18)
L40 Trellis_Dibit(71) R5 H1(3) PC(11) R49 Trellis_Dibit(17)
L39 Trellis_Dibit(70) R6 H1(2) PC(10) R50 Trellis_Dibit(16)
L38 Trellis_Dibit(69) R7 H1(1) PC(9) R51 Trellis_Dibit(15)
L37 Trellis_Dibit(68) R8 H1(0) PC(8) R52 Trellis_Dibit(14)
L36 Trellis_Dibit(67) R9 QR(7) QR(6) R53 Trellis_Dibit(13)
L35 Trellis_Dibit(66) R10 QR(5) QR(4) R54 Trellis_Dibit(12)
L34 Trellis_Dibit(65) R11 QR(3) QR(2) R55 Trellis_Dibit(11)
L33 Trellis_Dibit(64) R12 QR(1) QR(0) R56 Trellis_Dibit(10)
L32 Trellis_Dibit(63) R13 Golay(9) Golay(8) R57 Trellis_Dibit(9)
L31 Trellis_Dibit(62) R14 Golay(7) Golay(6) R58 Trellis_Dibit(8)
L30 Trellis_Dibit(61) R15 Golay(5) Golay(4) R59 Trellis_Dibit(7)
L29 Trellis_Dibit(60) R16 Golay(3) Golay(2) R60 Trellis_Dibit(6)
L28 Trellis_Dibit(59) R17 Golay(1) Golay(0) R61 Trellis_Dibit(5)
L27 Trellis_Dibit(58) R18 Trellis_Dibit(48) R62 Trellis_Dibit(4)
L26 Trellis_Dibit(57) R19 Trellis_Dibit(47) R63 Trellis_Dibit(3)
L25 Trellis_Dibit(56) R20 Trellis_Dibit(46) R64 Trellis_Dibit(2)
L24 Trellis_Dibit(55) R21 Trellis_Dibit(45) R65 Trellis_Dibit(1)
L23 Trellis_Dibit(54) R22 Trellis_Dibit(44) R66 Trellis_Dibit(0)
ETSI
ETSI TS 102 361
-
1 V1.4.5 (2007
-
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148
Table E.5: Transmit bit order for voice burst with SYNC (burst A)
Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0
L66 VS(215) VS(214) L22 VS(127) VS(126) R23 VS(87) VS(86)
L65 VS(213) VS(212) L21 VS(125) VS(124) R24 VS(85) VS(84)
L64 VS(211) VS(210) L20 VS(123) VS(122) R25 VS(83) VS(82)
L63 VS(209) VS(208) L19 VS(121) VS(120) R26 VS(81) VS(80)
L62 VS(207) VS(206) L18 VS(119) VS(118) R27 VS(79) VS(78)
L61 VS(205) VS(204) L17 VS(117) VS(116) R28 VS(77) VS(76)
L60 VS(203) VS(202) L16 VS(115) VS(114) R29 VS(75) VS(74)
L59 VS(201) VS(200) L15 VS(113) VS(112) R30 VS(73) VS(72)
L58 VS(199) VS(198) L14 VS(111) VS(110) R31 VS(71) VS(70)
L57 VS(197) VS(196) L13 VS(109) VS(108) R32 VS(69) VS(68)
L56 VS(195) VS(194) L12 V_Sync(47) V_Sync(46) R33 VS(67) VS(66)
L55 VS(193) VS(192) L11 V_Sync(45) V_Sync(44) R34 VS(65) VS(64)
L54 VS(191) VS(190) L10 V_Sync(43) V_Sync(42) R35 VS(63) VS(62)
L53 VS(189) VS(188) L9 V_Sync(41) V_Sync(40) R36 VS(61) VS(60)
L52 VS(187) VS(186) L8 V_Sync(39) V_Sync(38) R37 VS(59) VS(58)
L51 VS(185) VS(184) L7 V_Sync(37) V_Sync(36) R38 VS(57) VS(56)
L50 VS(183) VS(182) L6 V_Sync(35) V_Sync(34) R39 VS(55) VS(54)
L49 VS(181) VS(180) L5 V_Sync(33) V_Sync(32) R40 VS(53) VS(52)
L48 VS(179) VS(178) L4 V_Sync(31) V_Sync(30) R41 VS(51) VS(50)
L47 VS(177) VS(176) L3 V_Sync(29) V_Sync(28) R42 VS(49) VS(48)
L46 VS(175) VS(174) L2 V_Sync(27) V_Sync(26) R43 VS(47) VS(46)
L45 VS(173) VS(172) L1 V_Sync(25) V_Sync(24) R44 VS(45) VS(44)
L44 VS(171) VS(170) R1 V_Sync(23) V_Sync(22) R45 VS(43) VS(42)
L43 VS(169) VS(168) R2 V_Sync(21) V_Sync(20) R46 VS(41) VS(40)
L42 VS(167) VS(166) R3 V_Sync(19) V_Sync(18) R47 VS(39) VS(38)
L41 VS(165) VS(164) R4 V_Sync(17) V_Sync(16) R48 VS(37) VS(36)
L40 VS(163) VS(162) R5 V_Sync(15) V_Sync(14) R49 VS(35) VS(34)
L39 VS(161) VS(160) R6 V_Sync(13) V_Sync(12) R50 VS(33) VS(32)
L38 VS(159) VS(158) R7 V_Sync(11) V_Sync(10) R51 VS(31) VS(30)
L37 VS(157) VS(156) R8 V_Sync(9) V_Sync(8) R52 VS(29) VS(28)
L36 VS(155) VS(154) R9 V_Sync(7) V_Sync(6) R53 VS(27) VS(26)
L35 VS(153) VS(152) R10 V_Sync(5) V_Sync(4) R54 VS(25) VS(24)
L34 VS(151) VS(150) R11 V_Sync(3) V_Sync(2) R55 VS(23) VS(22)
L33 VS(149) VS(148) R12 V_Sync(1) V_Sync(0) R56 VS(21) VS(20)
L32 VS(147) VS(146) R13 VS(107) VS(106) R57 VS(19) VS(18)
L31 VS(145) VS(144) R14 VS(105) VS(104) R58 VS(17) VS(16)
L30 VS(143) VS(142) R15 VS(103) VS(102) R59 VS(15) VS(14)
L29 VS(141) VS(140) R16 VS(101) VS(100) R60 VS(13) VS(12)
L28 VS(139) VS(138) R17 VS(99) VS(98) R61 VS(11) VS(10)
L27 VS(137) VS(136) R18 VS(97) VS(96) R62 VS(9) VS(8)
L26 VS(135) VS(134) R19 VS(95) VS(94) R63 VS(7) VS(6)
L25 VS(133) VS(132) R20 VS(93) VS(92) R64 VS(5) VS(4)
L24 VS(131) VS(130) R21 VS(91) VS(90) R65 VS(3) VS(2)
L23 VS(129) VS(128) R22 VS(89) VS(88) R66 VS(1) VS(0)
ETSI
ETSI TS 102 361
-
1 V1.4.5 (2007
-
12)
149
Table E.6: Transmit bit order for voice burst with embedded signalling fragment 1
Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0
L66 VS(215) VS(214) L22 VS(127) VS(126) R23 VS(87) VS(86)
L65 VS(213) VS(212) L21 VS(125) VS(124) R24 VS(85) VS(84)
L64 VS(211) VS(210) L20 VS(123) VS(122) R25 VS(83) VS(82)
L63 VS(209) VS(208) L19 VS(121) VS(120) R26 VS(81) VS(80)
L62 VS(207) VS(206) L18 VS(119) VS(118) R27 VS(79) VS(78)
L61 VS(205) VS(204) L17 VS(117) VS(116) R28 VS(77) VS(76)
L60 VS(203) VS(202) L16 VS(115) VS(114) R29 VS(75) VS(74)
L59 VS(201) VS(200) L15 VS(113) VS(112) R30 VS(73) VS(72)
L58 VS(199) VS(198) L14 VS(111) VS(110) R31 VS(71) VS(70)
L57 VS(197) VS(196) L13 VS(109) VS(108) R32 VS(69) VS(68)
L56 VS(195) VS(194) L12 CC(3) CC(2) R33 VS(67) VS(66)
L55 VS(193) VS(192) L11 CC(1) CC(0) R34 VS(65) VS(64)
L54 VS(191) VS(190) L10 PI LCSS(1) R35 VS(63) VS(62)
L53 VS(189) VS(188) L9 LCSS(0) QR(8) R36 VS(61) VS(60)
L52 VS(187) VS(186) L8 LC(71) LC(60) R37 VS(59) VS(58)
L51 VS(185) VS(184) L7 LC(49) LC(39) R38 VS(57) VS(56)
L50 VS(183) VS(182) L6 LC(29) LC(19) R39 VS(55) VS(54)
L49 VS(181) VS(180) L5 LC(9) PC(15) R40 VS(53) VS(52)
L48 VS(179) VS(178) L4 LC(70) LC(59) R41 VS(51) VS(50)
L47 VS(177) VS(176) L3 LC(48) LC(38) R42 VS(49) VS(48)
L46 VS(175) VS(174) L2 LC(28) LC(18) R43 VS(47) VS(46)
L45 VS(173) VS(172) L1 LC(8) PC(14) R44 VS(45) VS(44)
L44 VS(171) VS(170) R1 LC(69) LC(58) R45 VS(43) VS(42)
L43 VS(169) VS(168) R2 LC(47) LC(37) R46 VS(41) VS(40)
L42 VS(167) VS(166) R3 LC(27) LC(17) R47 VS(39) VS(38)
L41 VS(165) VS(164) R4 LC(7) PC(13) R48 VS(37) VS(36)
L40 VS(163) VS(162) R5 LC(68) LC(57) R49 VS(35) VS(34)
L39 VS(161) VS(160) R6 LC(46) LC(36) R50 VS(33) VS(32)
L38 VS(159) VS(158) R7 LC(26) LC(16) R51 VS(31) VS(30)
L37 VS(157) VS(156) R8 LC(6) PC(12) R52 VS(29) VS(28)
L36 VS(155) VS(154) R9 QR(7) QR(6) R53 VS(27) VS(26)
L35 VS(153) VS(152) R10 QR(5) QR(4) R54 VS(25) VS(24)
L34 VS(151) VS(150) R11 QR(3) QR(2) R55 VS(23) VS(22)
L33 VS(149) VS(148) R12 QR(1) QR(0) R56 VS(21) VS(20)
L32 VS(147) VS(146) R13 VS(107) VS(106) R57 VS(19) VS(18)
L31 VS(145) VS(144) R14 VS(105) VS(104) R58 VS(17) VS(16)
L30 VS(143) VS(142) R15 VS(103) VS(102) R59 VS(15) VS(14)
L29 VS(141) VS(140) R16 VS(101) VS(100) R60 VS(13) VS(12)
L28 VS(139) VS(138) R17 VS(99) VS(98) R61 VS(11) VS(10)
L27 VS(137) VS(136) R18 VS(97) VS(96) R62 VS(9) VS(8)
L26 VS(135) VS(134) R19 VS(95) VS(94) R63 VS(7) VS(6)
L25 VS(133) VS(132) R20 VS(93) VS(92) R64 VS(5) VS(4)
L24 VS(131) VS(130) R21 VS(91) VS(90) R65 VS(3) VS(2)
L23 VS(129) VS(128) R22 VS(89) VS(88) R66 VS(1) VS(0)
ETSI
ETSI TS 102 361
-
1 V1.4.5 (2007
-
12)
150
Table E.7: Transmit bit order for voice burst with embedded signalling fragment 2
Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0
L66 VS(215) VS(214) L22 VS(127) VS(126) R23 VS(87) VS(86)
L65 VS(213) VS(212) L21 VS(125) VS(124) R24 VS(85) VS(84)
L64 VS(211) VS(210) L20 VS(123) VS(122) R25 VS(83) VS(82)
L63 VS(209) VS(208) L19 VS(121) VS(120) R26 VS(81) VS(80)
L62 VS(207) VS(206) L18 VS(119) VS(118) R27 VS(79) VS(78)
L61 VS(205) VS(204) L17 VS(117) VS(116) R28 VS(77) VS(76)
L60 VS(203) VS(202) L16 VS(115) VS(114) R29 VS(75) VS(74)
L59 VS(201) VS(200) L15 VS(113) VS(112) R30 VS(73) VS(72)
L58 VS(199) VS(198) L14 VS(111) VS(110) R31 VS(71) VS(70)
L57 VS(197) VS(196) L13 VS(109) VS(108) R32 VS(69) VS(68)
L56 VS(195) VS(194) L12 CC(3) CC(2) R33 VS(67) VS(66)
L55 VS(193) VS(192) L11 CC(1) CC(0) R34 VS(65) VS(64)
L54 VS(191) VS(190) L10 PI LCSS(1) R35 VS(63) VS(62)
L53 VS(189) VS(188) L9 LCSS(0) QR(8) R36 VS(61) VS(60)
L52 VS(187) VS(186) L8 LC(67) LC(56) R37 VS(59) VS(58)
L51 VS(185) VS(184) L7 LC(45) LC(35) R38 VS(57) VS(56)
L50 VS(183) VS(182) L6 LC(25) LC(15) R39 VS(55) VS(54)
L49 VS(181) VS(180) L5 LC(5) PC(11) R40 VS(53) VS(52)
L48 VS(179) VS(178) L4 LC(66) LC(55) R41 VS(51) VS(50)
L47 VS(177) VS(176) L3 LC(44) LC(34) R42 VS(49) VS(48)
L46 VS(175) VS(174) L2 LC(24) LC(14) R43 VS(47) VS(46)
L45 VS(173) VS(172) L1 LC(4) PC(10) R44 VS(45) VS(44)
L44 VS(171) VS(170) R1 LC(65) LC(54) R45 VS(43) VS(42)
L43 VS(169) VS(168) R2 LC(43) LC(33) R46 VS(41) VS(40)
L42 VS(167) VS(166) R3 LC(23) LC(13) R47 VS(39) VS(38)
L41 VS(165) VS(164) R4 LC(3) PC(9) R48 VS(37) VS(36)
L40 VS(163) VS(162) R5 LC(64) LC(53) R49 VS(35) VS(34)
L39 VS(161) VS(160) R6 LC(42) LC(32) R50 VS(33) VS(32)
L38 VS(159) VS(158) R7 LC(22) LC(12) R51 VS(31) VS(30)
L37 VS(157) VS(156) R8 LC(2) PC(8) R52 VS(29) VS(28)
L36 VS(155) VS(154) R9 QR(7) QR(6) R53 VS(27) VS(26)
L35 VS(153) VS(152) R10 QR(5) QR(4) R54 VS(25) VS(24)
L34 VS(151) VS(150) R11 QR(3) QR(2) R55 VS(23) VS(22)
L33 VS(149) VS(148) R12 QR(1) QR(0) R56 VS(21) VS(20)
L32 VS(147) VS(146) R13 VS(107) VS(106) R57 VS(19) VS(18)
L31 VS(145) VS(144) R14 VS(105) VS(104) R58 VS(17) VS(16)
L30 VS(143) VS(142) R15 VS(103) VS(102) R59 VS(15) VS(14)
L29 VS(141) VS(140) R16 VS(101) VS(100) R60 VS(13) VS(12)
L28 VS(139) VS(138) R17 VS(99) VS(98) R61 VS(11) VS(10)
L27 VS(137) VS(136) R18 VS(97) VS(96) R62 VS(9) VS(8)
L26 VS(135) VS(134) R19 VS(95) VS(94) R63 VS(7) VS(6)
L25 VS(133) VS(132) R20 VS(93) VS(92) R64 VS(5) VS(4)
L24 VS(131) VS(130) R21 VS(91) VS(90) R65 VS(3) VS(2)
L23 VS(129) VS(128) R22 VS(89) VS(88) R66 VS(1) VS(0)
ETSI
ETSI TS 102 361
-
1 V1.4.5 (2007
-
12)
151
Table E.8: Transmit bit order for voice burst with embedded signalling fragment 3
Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0
L66 VS(215) VS(214) L22 VS(127) VS(126) R23 VS(87) VS(86)
L65 VS(213) VS(212) L21 VS(125) VS(124) R24 VS(85) VS(84)
L64 VS(211) VS(210) L20 VS(123) VS(122) R25 VS(83) VS(82)
L63 VS(209) VS(208) L19 VS(121) VS(120) R26 VS(81) VS(80)
L62 VS(207) VS(206) L18 VS(119) VS(118) R27 VS(79) VS(78)
L61 VS(205) VS(204) L17 VS(117) VS(116) R28 VS(77) VS(76)
L60 VS(203) VS(202) L16 VS(115) VS(114) R29 VS(75) VS(74)
L59 VS(201) VS(200) L15 VS(113) VS(112) R30 VS(73) VS(72)
L58 VS(199) VS(198) L14 VS(111) VS(110) R31 VS(71) VS(70)
L57 VS(197) VS(196) L13 VS(109) VS(108) R32 VS(69) VS(68)
L56 VS(195) VS(194) L12 CC(3) CC(2) R33 VS(67) VS(66)
L55 VS(193) VS(192) L11 CC(1) CC(0) R34 VS(65) VS(64)
L54 VS(191) VS(190) L10 PI LCSS(1) R35 VS(63) VS(62)
L53 VS(189) VS(188) L9 LCSS(0) QR(8) R36 VS(61) VS(60)
L52 VS(187) VS(186) L8 LC(63) LC(52) R37 VS(59) VS(58)
L51 VS(185) VS(184) L7 LC(41) LC(31) R38 VS(57) VS(56)
L50 VS(183) VS(182) L6 LC(21) LC(11) R39 VS(55) VS(54)
L49 VS(181) VS(180) L5 LC(1) PC(7) R40 VS(53) VS(52)
L48 VS(179) VS(178) L4 LC(62) LC(51) R41 VS(51) VS(50)
L47 VS(177) VS(176) L3 LC(40) LC(30) R42 VS(49) VS(48)
L46 VS(175) VS(174) L2 LC(20) LC(10) R43 VS(47) VS(46)
L45 VS(173) VS(172) L1 LC(0) PC(6) R44 VS(45) VS(44)
L44 VS(171) VS(170) R1 LC(61) LC(50) R45 VS(43) VS(42)
L43 VS(169) VS(168) R2 CS(4) CS(3) R46 VS(41) VS(40)
L42 VS(167) VS(166) R3 CS(2) CS(1) R47 VS(39) VS(38)
L41 VS(165) VS(164) R4 CS(0) PC(5) R48 VS(37) VS(36)
L40 VS(163) VS(162) R5 H1(4) H2(4) R49 VS(35) VS(34)
L39 VS(161) VS(160) R6 H3(4) H4(4) R50 VS(33) VS(32)
L38 VS(159) VS(158) R7 H5(4) H6(4) R51 VS(31) VS(30)
L37 VS(157) VS(156) R8 H7(4) PC(4) R52 VS(29) VS(28)
L36 VS(155) VS(154) R9 QR(7) QR(6) R53 VS(27) VS(26)
L35 VS(153) VS(152) R10 QR(5) QR(4) R54 VS(25) VS(24)
L34 VS(151) VS(150) R11 QR(3) QR(2) R55 VS(23) VS(22)
L33 VS(149) VS(148) R12 QR(1) QR(0) R56 VS(21) VS(20)
L32 VS(147) VS(146) R13 VS(107) VS(106) R57 VS(19) VS(18)
L31 VS(145) VS(144) R14 VS(105) VS(104) R58 VS(17) VS(16)
L30 VS(143) VS(142) R15 VS(103) VS(102) R59 VS(15) VS(14)
L29 VS(141) VS(140) R16 VS(101) VS(100) R60 VS(13) VS(12)
L28 VS(139) VS(138) R17 VS(99) VS(98) R61 VS(11) VS(10)
L27 VS(137) VS(136) R18 VS(97) VS(96) R62 VS(9) VS(8)
L26 VS(135) VS(134) R19 VS(95) VS(94) R63 VS(7) VS(6)
L25 VS(133) VS(132) R20 VS(93) VS(92) R64 VS(5) VS(4)
L24 VS(131) VS(130) R21 VS(91) VS(90) R65 VS(3) VS(2)
L23 VS(129) VS(128) R22 VS(89) VS(88) R66 VS(1) VS(0)
ETSI
ETSI TS 102 361
-
1 V1.4.5 (2007
-
12)
152
Table E.9: Transmit bit order for voice burst with embedded signalling fragment 4
Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0
L66 VS(215) VS(214) L22 VS(127) VS(126) R23 VS(87) VS(86)
L65 VS(213) VS(212) L21 VS(125) VS(124) R24 VS(85) VS(84)
L64 VS(211) VS(210) L20 VS(123) VS(122) R25 VS(83) VS(82)
L63 VS(209) VS(208) L19 VS(121) VS(120) R26 VS(81) VS(80)
L62 VS(207) VS(206) L18 VS(119) VS(118) R27 VS(79) VS(78)
L61 VS(205) VS(204) L17 VS(117) VS(116) R28 VS(77) VS(76)
L60 VS(203) VS(202) L16 VS(115) VS(114) R29 VS(75) VS(74)
L59 VS(201) VS(200) L15 VS(113) VS(112) R30 VS(73) VS(72)
L58 VS(199) VS(198) L14 VS(111) VS(110) R31 VS(71) VS(70)
L57 VS(197) VS(196) L13 VS(109) VS(108) R32 VS(69) VS(68)
L56 VS(195) VS(194) L12 CC(3) CC(2) R33 VS(67) VS(66)
L55 VS(193) VS(192) L11 CC(1) CC(0) R34 VS(65) VS(64)
L54 VS(191) VS(190) L10 PI LCSS(1) R35 VS(63) VS(62)
L53 VS(189) VS(188) L9 LCSS(0) QR(8) R36 VS(61) VS(60)
L52 VS(187) VS(186) L8 H1(3) H2(3) R37 VS(59) VS(58)
L51 VS(185) VS(184) L7 H3(3) H4(3) R38 VS(57) VS(56)
L50 VS(183) VS(182) L6 H5(3) H6(3) R39 VS(55) VS(54)
L49 VS(181) VS(180) L5 H7(3) PC(3) R40 VS(53) VS(52)
L48 VS(179) VS(178) L4 H1(2) H2(2) R41 VS(51) VS(50)
L47 VS(177) VS(176) L3 H3(2) H4(2) R42 VS(49) VS(48)
L46 VS(175) VS(174) L2 H5(2) H6(2) R43 VS(47) VS(46)
L45 VS(173) VS(172) L1 H7(2) PC(2) R44 VS(45) VS(44)
L44 VS(171) VS(170) R1 H1(1) H2(1) R45 VS(43) VS(42)
L43 VS(169) VS(168) R2 H3(1) H4(1) R46 VS(41) VS(40)
L42 VS(167) VS(166) R3 H5(1) H6(1) R47 VS(39) VS(38)
L41 VS(165) VS(164) R4 H7(1) PC(1) R48 VS(37) VS(36)
L40 VS(163) VS(162) R5 H1(0) H2(0) R49 VS(35) VS(34)
L39 VS(161) VS(160) R6 H3(0) H4(0) R50 VS(33) VS(32)
L38 VS(159) VS(158) R7 H5(0) H6(0) R51 VS(31) VS(30)
L37 VS(157) VS(156) R8 H7(0) PC(0) R52 VS(29) VS(28)
L36 VS(155) VS(154) R9 QR(7) QR(6) R53 VS(27) VS(26)
L35 VS(153) VS(152) R10 QR(5) QR(4) R54 VS(25) VS(24)
L34 VS(151) VS(150) R11 QR(3) QR(2) R55 VS(23) VS(22)
L33 VS(149) VS(148) R12 QR(1) QR(0) R56 VS(21) VS(20)
L32 VS(147) VS(146) R13 VS(107) VS(106) R57 VS(19) VS(18)
L31 VS(145) VS(144) R14 VS(105) VS(104) R58 VS(17) VS(16)
L30 VS(143) VS(142) R15 VS(103) VS(102) R59 VS(15) VS(14)
L29 VS(141) VS(140) R16 VS(101) VS(100) R60 VS(13) VS(12)
L28 VS(139) VS(138) R17 VS(99) VS(98) R61 VS(11) VS(10)
L27 VS(137) VS(136) R18 VS(97) VS(96) R62 VS(9) VS(8)
L26 VS(135) VS(134) R19 VS(95) VS(94) R63 VS(7) VS(6)
L25 VS(133) VS(132) R20 VS(93) VS(92) R64 VS(5) VS(4)
L24 VS(131) VS(130) R21 VS(91) VS(90) R65 VS(3) VS(2)
L23 VS(129) VS(128) R22 VS(89) VS(88) R66 VS(1) VS(0)
ETSI
ETSI TS 102 361
-
1 V1.4.5 (20
07
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12)
153
Table E.10: Transmit bit order for voice burst with embedded RC
Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0
L66 VS(215) VS(214) L22 VS(127) VS(126) R23 VS(87) VS(86)
L65 VS(213) VS(212) L21 VS(125) VS(124) R24 VS(85) VS(84)
L64 VS(211) VS(210) L20 VS(123) VS(122) R25 VS(83) VS(82)
L63 VS(209) VS(208) L19 VS(121) VS(120) R26 VS(81) VS(80)
L62 VS(207) VS(206) L18 VS(119) VS(118) R27 VS(79) VS(78)
L61 VS(205) VS(204) L17 VS(117) VS(116) R28 VS(77) VS(76)
L60 VS(203) VS(202) L16 VS(115) VS(114) R29 VS(75) VS(74)
L59 VS(201) VS(200) L15 VS(113) VS(112) R30 VS(73) VS(72)
L58 VS(199) VS(198) L14 VS(111) VS(110) R31 VS(71) VS(70)
L57 VS(197) VS(196) L13 VS(109) VS(108) R32 VS(69) VS(68)
L56 VS(195) VS(194) L12 CC(3) CC(2) R33 VS(67) VS(66)
L55 VS(193) VS(192) L11 CC(1) CC(0) R34 VS(65) VS(64)
L54 VS(191) VS(190) L10 PI LCSS(1) R35 VS(63) VS(62)
L53 VS(189) VS(188) L9 LCSS(0) QR(8) R36 VS(61) VS(60)
L52 VS(187) VS(186) L8 RC(10) PC(7) R37 VS(59) VS(58)
L51 VS(185) VS(184) L7 RC(9) PC(6) R38 VS(57) VS(56)
L50 VS(183) VS(182) L6 RC(8) PC(5) R39 VS(55) VS(54)
L49 VS(181) VS(180) L5 RC(7) PC(4) R40 VS(53) VS(52)
L48 VS(179) VS(178) L4 RC(6) PC(3) R41 VS(51) VS(50)
L47 VS(177) VS(176) L3 RC(5) PC(2) R42 VS(49) VS(48)
L46 VS(175) VS(174) L2 RC(4) PC(1) R43 VS(47) VS(46)
L45 VS(173) VS(172) L1 RC(3) PC(0) R44 VS(45) VS(44)
L44 VS(171) VS(170) R1 RC(2) PC(15) R45 VS(43) VS(42)
L43 VS(169) VS(168) R2 RC(1) PC(14) R46 VS(41) VS(40)
L42 VS(167) VS(166) R3 RC(0) PC(13) R47 VS(39) VS(38)
L41 VS(165) VS(164) R4 H1(4) PC(12) R48 VS(37) VS(36)
L40 VS(163) VS(162) R5 H1(3) PC(11) R49 VS(35) VS(34)
L39 VS(161) VS(160) R6 H1(2) PC(10) R50 VS(33) VS(32)
L38 VS(159) VS(158) R7 H1(1) PC(9) R51 VS(31) VS(30)
L37 VS(157) VS(156) R8 H1(0) PC(8) R52 VS(29) VS(28)
L36 VS(155) VS(154) R9 QR(7) QR(6) R53 VS(27) VS(26)
L35 VS(153) VS(152) R10 QR(5) QR(4) R54 VS(25) VS(24)
L34 VS(151) VS(150) R11 QR(3) QR(2) R55 VS(23) VS(22)
L33 VS(149) VS(148) R12 QR(1) QR(0) R56 VS(21) VS(20)
L32 VS(147) VS(146) R13 VS(107) VS(106) R57 VS(19) VS(18)
L31 VS(145) VS(144) R14 VS(105) VS(104) R58 VS(17) VS(16)
L30 VS(143) VS(142) R15 VS(103) VS(102) R59 VS(15) VS(14)
L29 VS(141) VS(140) R16 VS(101) VS(100) R60 VS(13) VS(12)
L28 VS(139) VS(138) R17 VS(99) VS(98) R61 VS(11) VS(10)
L27 VS(137) VS(136) R18 VS(97) VS(96) R62 VS(9) VS(8)
L26 VS(135) VS(134) R19 VS(95) VS(94) R63 VS(7) VS(6)
L25 VS(133) VS(132) R20 VS(93) VS(92) R64 VS(5) VS(4)
L24 VS(131) VS(130) R21 VS(91) VS(90) R65 VS(3) VS(2)
L23 VS(129) VS(128) R22 VS(89) VS(88) R66 VS(1) VS(0)
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Table E.11: Transmit bit order for voice burst with Null embedded message
Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0
L66 VS(215) VS(214) L22 VS(127) VS(126) R23 VS(87) VS(86)
L65 VS(213) VS(212) L21 VS(125) VS(124) R24 VS(85) VS(84)
L64 VS(211) VS(210) L20 VS(123) VS(122) R25 VS(83) VS(82)
L63 VS(209) VS(208) L19 VS(121) VS(120) R26 VS(81) VS(80)
L62 VS(207) VS(206) L18 VS(119) VS(118) R27 VS(79) VS(78)
L61 VS(205) VS(204) L17 VS(117) VS(116) R28 VS(77) VS(76)
L60 VS(203) VS(202) L16 VS(115) VS(114) R29 VS(75) VS(74)
L59 VS(201) VS(200) L15 VS(113) VS(112) R30 VS(73) VS(72)
L58 VS(199) VS(198) L14 VS(111) VS(110) R31 VS(71) VS(70)
L57 VS(197) VS(196) L13 VS(109) VS(108) R32 VS(69) VS(68)
L56 VS(195) VS(194) L12 CC(3) CC(2) R33 VS(67) VS(66)
L55 VS(193) VS(192) L11 CC(1) CC(0) R34 VS(65) VS(64)
L54 VS(191) VS(190) L10 PI LCSS(1) R35 VS(63) VS(62)
L53 VS(189) VS(188) L9 LCSS(0) QR(8) R36 VS(61) VS(60)
L52 VS(187) VS(186) L8 N_LC(10) PC(7) R37 VS(59) VS(58)
L51 VS(185) VS(184) L7 N_LC(9) PC(6) R38 VS(57) VS(56)
L50 VS(183) VS(182) L6 N_LC(8) PC(5) R39 VS(55) VS(54)
L49 VS(181) VS(180) L5 N_LC(7) PC(4) R40 VS(53) VS(52)
L48 VS(179) VS(178) L4 N_LC(6) PC(3) R41 VS(51) VS(50)
L47 VS(177) VS(176) L3 N_LC(5) PC(2) R42 VS(49) VS(48)
L46 VS(175) VS(174) L2 N_LC(4) PC(1) R43 VS(47) VS(46)
L45 VS(173) VS(172) L1 N_LC(3) PC(0) R44 VS(45) VS(44)
L44 VS(171) VS(170) R1 N_LC(2) PC(15) R45 VS(43) VS(42)
L43 VS(169) VS(168) R2 N_LC(1) PC(14) R46 VS(41) VS(40)
L42 VS(167) VS(166) R3 N_LC(0) PC(13) R47 VS(39) VS(38)
L41 VS(165) VS(164) R4 H1(4) PC(12) R48 VS(37) VS(36)
L40 VS(163) VS(162) R5 H1(3) PC(11) R49 VS(35) VS(34)
L39 VS(161) VS(160) R6 H1(2) PC(10) R50 VS(33) VS(32)
L38 VS(159) VS(158) R7 H1(1) PC(9) R51 VS(31) VS(30)
L37 VS(157) VS(156) R8 H1(0) PC(8) R52 VS(29) VS(28)
L36 VS(155) VS(154) R9 QR(7) QR(6) R53 VS(27) VS(26)
L35 VS(153) VS(152) R10 QR(5) QR(4) R54 VS(25) VS(24)
L34 VS(151) VS(150) R11 QR(3) QR(2) R55 VS(23) VS(22)
L33 VS(149) VS(148) R12 QR(1) QR(0) R56 VS(21) VS(20)
L32 VS(147) VS(146) R13 VS(107) VS(106) R57 VS(19) VS(18)
L31 VS(145) VS(144) R14 VS(105) VS(104) R58 VS(17) VS(16)
L30 VS(143) VS(142) R15 VS(103) VS(102) R59 VS(15) VS(14)
L29 VS(141) VS(140) R16 VS(101) VS(100) R60 VS(13) VS(12)
L28 VS(139) VS(138) R17 VS(99) VS(98) R61 VS(11) VS(10)
L27 VS(137) VS(136) R18 VS(97) VS(96) R62 VS(9) VS(8)
L26 VS(135) VS(134) R19 VS(95) VS(94) R63 VS(7) VS(6)
L25 VS(133) VS(132) R20 VS(93) VS(92) R64 VS(5) VS(4)
L24 VS(131) VS(130) R21 VS(91) VS(90) R65 VS(3) VS(2)
L23 VS(129) VS(128) R22 VS(89) VS(88) R66 VS(1) VS(0)
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Table E.12: Transmit bit order for standalone RC burst
Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0 Symbol Bit 1 Bit 0
L24 CC(3) CC(2) L8 R_Sync(39) R_Sync(38) R9 R_Sync(7) R_Sync(6)
L23 CC(1) CC(0) L7 R_Sync(37) R_Sync(36) R10 R_Sync(5) R_Sync(4)
L22 PI LCSS(1) L6 R_Sync(35) R_Sync(34) R11 R_Sync(3) R_Sync(2)
L21 LCSS(0) QR(8) L5 R_Sync(33) R_Sync(32) R12 R_Sync(1) R_Sync(0)
L20 RC(10) PC(7) L4 R_Sync(31) R_Sync(30) R13 RC(2) PC(15)
L19 RC(9) PC(6) L3 R_Sync(29) R_Sync(28) R14 RC(1) PC(14)
L18 RC(8) PC(5) L2 R_Sync(27) R_Sync(26) R15 RC(0) PC(13)
L17 RC(7) PC(4) L1 R_Sync(25) R_Sync(24) R16 H1(4) PC(12)
L16 RC(6) PC(3) R1 R_Sync(23) R_Sync(22) R17 H1(3) PC(11)
L15 RC(5) PC(2) R2 R_Sync(21) R_Sync(20) R18 H1(2) PC(10)
L14 RC(4) PC(1) R3 R_Sync(19) R_Sync(18) R19 H1(1) PC(9)
L13 RC(3) PC(0) R4 R_Sync(17) R_Sync(16) R20 H1(0) PC(8)
L12 R_Sync(47) R_Sync(46) R5 R_Sync(15) R_Sync(14) R21 QR(7) QR(6)
L11 R_Sync(45) R_Sync(44) R6 R_Sync(13) R_Sync(12) R22 QR(5) QR(4)
L10 R_Sync(43) R_Sync(42) R7 R_Sync(11) R_Sync(10) R23 QR(3) QR(2)
L9 R_Sync(41) R_Sync(40) R8 R_Sync(9) R_Sync(8) R24 QR(1) QR(0)
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Annex F (normative):
Timers and constants in DMR
This annex lists the timers and constants in a DMR entity.
Where indicated, a value should be chosen by the MS/BS designer from within the specified range. For other timers and
constants, a default value may be specified and the value of these timers and constants shall be configurable within the
DMR entity (MS or BS).
F.1 Layer 2 timers
T_ChMonTo Channel activity monitoring time-out.
Minimum value = 40 ms.
T_ChSyncTo Channel activity synchronization time-out.
Minimum value = 390 ms.
T_MSInactiv MS inactivity timer.
Default value = 5 s.
Maximum value = infinite.
T_CallHt Call hangtime period.
Default value = 3 s.
Maximum value = infinite.
T_ChHt Channel hangtime period.
T_ChHt = T_MSInactiv - T_CallHt.
T_Monitor Monitor timer.
Value chosen by MS designer.
Maximum value = 720 ms.
NOTE 2: The Monitor timer is the duration of time an MS has been monitoring the channel for RF and attempting
to acquire synchronization.
T_TxCC TX CC timer.
Value chosen by MS designer.
Maximum value = 360 ms.
NOTE 3: The TX CC timer is a direct mode only timer. It is used when a transmission is requested from the
Out_of_Sync or In_Sync_Unknown_System states and the MS has determined activity resides on the
channel. This timer sets the duration that the MS will attempt to acquire the Colour Code information
embedded in the received DMR signal.
T_SyncWu Sync WU timer.
Value chosen by MS designer.
Maximum value = 360 ms.
NOTE 4: The Sync WU timer is a MS mode parameter. This timer sets the duration that the MS will attempt to
acquire a DMR sync pattern after transmission of the Wakeup PDU to activate the BS outbound.
T_TxCCSlot TX CC slot timer.
Value chosen by MS designer.
Maximum value = 720 ms.
NOTE 5: The TX CC slot timer is a MS mode timer. It is used when a transmission is requested from the
Out_of_Sync or In_Sync_Unknown_System states and the MS has determined activity resides on the
channel. This timer sets the duration that the MS will attempt to acquire the Colour Code and slot
numbering information embedded in the received DMR signal.
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T_IdleSrch Idle Search timer.
Value chosen by MS designer.
Maximum value = 540 ms.
NOTE 6: The Idle Search timer is a MS mode timer. It is used when a transmission is requested and the MS has
matched the Colour Code and determined the slotting structure. This timer sets the duration that the MS
will attempt to determine the desired slot is idle before denying the transmission.
T_Holdoff Random holdoff timer.
Range chosen by MS designer.
MS randomly generates timer duration from uniform distribution over the range.
Minimum value = 0 ms.
Recommended maximum value = 1 000 ms for non-time critical CSBK ACK/NACK messages.
NOTE 7: The Random_Holdoff_Timer is a MS mode timer. It is used when a non-time critical transmission is
required and the channel is busy. Here the MS waits a random amount of time before attempting to
transmit again. The actual range will be application specific.
NOTE 8: A use case example is data messages that are queued while the MS is waiting for the channel to become
idle. This will reduce collisions at the BS.
F.2 Layer 2 constants
N_RssiLo RSSI threshold value for monitoring channel activity.
Recommended default values for Polite to All channel access policy are shown in table F.1.
Recommended default value for Polite to Own Colour Code channel access policy is -122 dBm.
The absolute accuracy shall not exceed
±
4 dB.
Table F.1: Recommended default Polite to All N_RssiLo threshold levels
Frequency band Default threshold level (dBm)
50 MHz to 137 MHz -101
> 137 MHz to 300 MHz -107
> 300 MHz -113
NOTE: The threshold levels are given for a 50 Ω impedance.
N_Wakeup Wakeup Message Threshold.
Value chosen by MS designer.
Suggested value = 2
NOTE 1: The Wakeup Message Threshold is a MS mode parameter. It sets the maximum number of times an MS
will loop through the TX_Wakeup state while attempting to activate the BS outbound.
n_DFragMax Data fragment maximum length.
Value = 1 500 octets.
NOTE 2: Protocol layer 2 needs to buffer up to N_DFMax data length before passing to higher layer.
N_BlockMax Maximum number of blocks in a packet, including the header block.
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Annex G (informative):
High level states overview
This annex describes some SDL diagrams which may be used as an overview of high level states. As this annex is
informative, real implementations may have different state descriptions.
G.1 High Level MS states and SDL description
High Level MS states are divided into two levels. The first level deals with synchronization, Colour Code (CC) and
slotting (repeater mode only) recognition. The second level deals with general hangtime, reception and transmission
control.
NOTE: These levels will be referenced for various facilities in TS 102 361-2 [5] as well as for channel access.
G.1.1 MS Level 1 SDL
The MS Level 1 SDLs are shown in figure G.1 for direct mode and figure G.2 for repeater mode respectively. The
Level 1 states are Out_of_Sync and In_Sync. These are defined below:
• Out_of_Sync: This state occurs when the MS has not acquired or has lost sync on the channel. This can occur
due to numerous reasons, stemming from lack of signal or co-channel interference from analogue or digital
radios to travelling through a deep fade.
• In_Sync: This state occurs after a MS has successfully detected DMR voice or data sync. In this state the MS
searches for matching Colour Code in direct mode and matching Colour Code and outbound slotting structure
in repeater mode.
The In_Sync state is further divided into 2 levels. These are Unknown_System and My_System. Descriptions of these
states are listed below.
• Unknown_System: This state occurs when the Colour Code in direct mode or both the Colour Code and slot
number identifier in repeater mode are unknown to the receiver MS. If the Colour Code does not match or
sync is lost, the MS transitions to the Out_of_Sync state. If the Colour Code matches and the slotting structure
is determined (repeater mode only) the MS transitions to the My_System state.
• My_System: This state occurs when the Colour Code in direct mode or both the Colour Code and slot number
identifier in repeater mode are known to the receiver MS. If sync is lost or the Colour Code can no longer be
decoded, the MS transitions to the Out_of_Sync state. It will also transition to the Out_of_Sync state when it
loses confidence in the Colour Code.
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process MS_Level_1_P2PM 1(1)
Out_of_Sync
Detect_Sync
In_Sync_
Unknown_System
Lost_Sync
Found_My_
System
Match Colour
Code
Not_My_
System
Different
Colour Code
Out_of_Sync Out_of_Sync
In_Sync_
My_System
Lost_Sync
Not_My_
System
Colour Code
Changed
Lost_Colour_
Code
Out_of_Sync Out_of_Sync Out_of_Sync
Figure G.1: MS Level 1 SDL: direct mode
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process MS_Level_1_RM 1(1)
Out_of_Sync
Detect_Sync
In_Sync_
Unknown_System
Not_My_
System
Different
Colour Code
Lost_Sync
Undetermined_
Slots
TC bits
undetermined
Out_of_Sync Out_of_Sync Out_of_Sync
Found_My_
System
Match Colour
Code
Found_My_
Slot
TC bits
determined
TC_Bits
Colour_
Code
Out_of_Sync
In_Sync_
My_System
Out_of_Sync
Lost_Sync
Not_My_
System
Colour Code
Changed
Lost_Colour_
Code
Lost_
Slotting
Unable to
decode TC
bits
Out_of_Sync Out_of_Sync Out_of_Sync Out_of_Sync
Undetermined Determined Match Unmatched
Figure G.2: MS Level 1 SDL: repeater mode
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G.1.2 MS Level 2 SDL
The MS Level 2 SDL occurs in the Level 1 In_Sync_My_System state. These are the same for direct mode and repeater
mode and are illustrated in figure G.3. The Level 2 states are Not_in_Call, My_Call, Others_Call, In_Session and
Transmit. These are defined below:
NOTE 1: Group Call HMSC and MSCs reference these states.
• Not_in_Call: An MS resides in this state when it is unable to determine a destination ID. In repeater mode this
can occur during channel hangtime. Determination of a destination ID transitions the MS to either My_Call,
Others_Call or In_Session state.
• My_Call: In this state the MS talk group(s) or individual ID is decoded during voice traffic via a
Voice_LC_Header or an Embedded_LC. Here the MS is party to the call.
• Others_Call: An MS transitions to this state when the received talk group(s) or individual ID does not match
the talk group(s) or individual ID of the MS. While in this state if a new ID matches, then it will transition to
either My_Call if received via a Voice_LC_Header or an Embedded_LC or In_Session if received via a
Voice_Terminator_with_LC.
NOTE 2: This state includes the reception of both voice and call hangtime for the other call.
• In_Session: An MS transitions to this state when the MS talk group(s) or individual ID is decoded via a
Voice_Terminator_with_LC. This is call hangtimeHere the MS is party to the call.
• Transmit: In this state the MS transmits voice, data or CSBKs in the appropriate slot.
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process MS_Level_2 (In_Sync_My_System) 1(1)
Not_in_Call
Found_
Destination_ID
My_ID
In_Session My_Call Others_Call
Idle_Packet
Found_
New_ID
Found_
New_ID
Voice_
Terminator
Idle_Packet
Found_
New_ID
Idle_Packet
Not_in_Call My_ID Not_in_Call Not_in_Call
Others_Call In_Sesion
My_ID
In_Session Others_Call My_Call
yes, In_Terminator
yes, In_Header_
OR_In_LC
no
no yes
yes,In_
Terminator
no
yes, In_Header_
OR_In_LC
Figure G.3: MS level 2 SDL
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3
G.2 High level BS states and SDL descriptions
High Level BS states are divided into two levels. The first level deals with the control of both slots and activating and
deactivating the BS outbound channel. The second level deals with control of a single slot. This level describes
repeating, call hangtime and channel hangtime.
In the following diagrams the slot number refers to the outbound slot. Therefore, outbound slot 1 implies inbound slot 1
for offset mode and inbound slot 2 for aligned mode, as defined in clause 5.1 of the present document. Also in the
following diagrams, BOR and EOR are events that cause High Level BS transitions. These are overview conceptual
messages that will be feature specific.
G.2.1 BS Both Slots SDL
The BS Both Slots SDL describes the overall control of both slots and is illustrated in figure G.4. The states are
BR_Hibernating, Hangtime, Repeating_Slot_1, Repeating_Slot_2 and Repeating_Both_Slots. These states are defined
below:
• BS_Hibernating: In this state the BS is attempting to decode a valid wakeup message from an MS. The
outbound is inactive during this state. Upon reception of a valid wakeup message the BS starts a Mobile
Station Inactivity Timer (T_MSInactiv) and transitions to the Hangtime state.
NOTE: The T_MSInactiv is a timer that starts when no valid activity is detected on the inbound channel or upon
the reception of a valid wakeup message. Reception of valid activity with the exception of the wakeup
message cancels the T_MSInactiv.
• Hangtime: In this state the BS is transmitting channel hangtime (Idle) messages on both slots. The reception
of bursts will transition the BS to the appropriate repeating state; Repeating_Slot_1 or Repeating_Slot_2. Also,
the expiration of the T_MSInactiv will transition the BS back to the BR_Hibernating state.
• Repeating_Slot_1: In this state the BS is actively repeating bursts on slot 1 and transmitting Idle messages on
slot 2. An EOR_Slot_1 will transition the BS to the Hangtime state. A BOR_Slot_2 will transition the BS to
the Repeating_Both_Slots state.
• Repeating_Slot_2: In this state the BS is actively repeating bursts on slot 2 and transmitting Idle messages on
slot 1. An EOR_Slot_2 will transition the BS to the Hangtime state. A BOR_Slot_1 will transition the BS to
the Repeating_Both_Slots state.
• Repeating_Both_Slots: In this state the BS is repeating activity on both slots. An EOR_Slot_1 or
EOR_Slot_2 will transition the BS to the respective Repeating_Slot_1 or Repeating_Slot_2 states.
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process BS_Both_Slots 1(1)
BS_
Hibernating
CSBK_RX BS_Dwn_Act
Set (T_
MSInactiv)
Hangtime
T_
MSInactiv
BS_
Hibernating
BOR_
Slot_1
Repeating_
Slot_1
EOR_
Slot_1
Set (T_
MSInactiv)
Hangtime
BOR_
Slot_2
Repeating_
Both_Slots
EOR_
Slot_2
Repeating_
Slot_1
EOR_
Slot_1
Repeating_
Slot_2
BOR_
Slot_2
Repeating_
Slot_2
BOR_
Slot_1
EOR_
Slot_2
Set (T_
MSInactiv)
Hangtime
Figure G.4: BS Both Slots SDL
G.2.2 BS Single Slot SDL
The BS Single Slot SDL describes the overall control of one of the two TDM slots and is illustrated in figure G.5. The
states are Channel_Hangtime, Call_Hangtime, and Repeating_Slot. These states are defined below:
• Channel_Hangtime: In this state the BS is transmitting channel hangtime (Idle) messages on the slot. The
reception of bursts will transition the BS to the Repeating_Slot state.
• Call_Hangtime: In this state the BS is transmitting call hangtime (Voice_Terminator_with_LC) messages on
the slot. The reception of bursts will transition the BS to the Repeating_Slot state. Also, the expiration of call
hangtime transitions the BS slot to the Channel_Hangtime state.
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• Repeating_Slot: In this state the BS is actively repeating bursts on the slot. An EOR will transition the BS to
the Call_Hangtime state.
process BS_Single_Slot 1(1)
Start_
Slot_1
Tx_Idle_
Packets
Channel_
Hangtime
CSBK_RX BOR
Repeat_
CSBK
Repeat_
Inbound
Channel_
Hangtime
Repeating_
Slot
EOR
TX_Call_
Hangtime
Call_
Hangtime
BOR
Call_Hangtime_
Expires
Repeating_
Slot
Channel_
Hangtime
Figure G.5: BS Single Slot SDL
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Annex H (normative):
Feature interoperability
The FID identifies one of several different feature sets.
The FLCO identifies the "over-air" feature within the given feature set.
To ensure interoperability at the air interface, features that are standardized in the Services and Facilities specification
TS 102 361-2 [5] and available in the equipment shall be accessible only via the combination of default SFID and
corresponding FLCO.
Features that are not standardized in the Services and Facilities specification TS 102 361-2 [5] are only available via an
alternative MFID.
H.1 Feature set ID (FID)
Each manufacturer may have multiple values of the MFIDs. The same MFID may be used for various protocols or
products if suitable from the manufacturer's point of view.
It is allowed that multiple manufacturers or application designers use the same MFID.
There is one range on FIDs available for MFID specific allocation as defined in clause 9.3.13 and copied in a short form
into table H.1.
Table H.1: Feature set ID information element content
Information element Length Value Remark
00000000
2
Standardized feature set ID for the services and facilities
defined in TS 102 361-2 [5] (SFID)
00000001
2
Reserved for future standardization
00000010
2
Reserved for future standardization
00000011
2
Reserved for future standardization
00000100
2
Manufacturer's specific feature set ID (MFID)
etc. etc.
01111111
2
Manufacturer's specific feature set ID (MFID)
Feature set ID 8
1xxxxxxx
2
Reserved for future MFID's allocation (MFID)
H.2 Application for Manufacturer's Feature set ID
This application form is provided by ETSI who is the central body for the management of the Manufacturer's Feature
set ID (MFID) values as described in the present document, clause 9.3.13. The application and allocation may be
implemented by other means such as a World Wide Web server application.
This form presented in annex I may be changed without notice by ETSI.
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Annex I (informative):
ETSI MFID application form
PROVISION OF AND RESTRICTED USAGE UNDERTAKING
relating to
a
Manufacturer's Specific Feature Set ID (MFID), to be used in mobile parts, portable parts and fixed parts
for Digital Mobile Radio, DMR.
Between
(COMPANY NAME)...................................................................................................................................
(COMPANY ADDRESS)............................................................................................................................
...................................................................................................................................................................
hereinafter called: the BENEFICIARY;
and
(COMPANY NAME)……..European Telecommunications Standards Institute
(COMPANY ADDRESS)…..06921 Sophia Antipolis CEDEX, France
hereinafter called: the PROVIDER.
Whereas
The BENEFICIARY has alleged that he fulfils the following criteria:
He is a manufacturer of DMR mobile parts, portable parts or DMR fixed parts.
The PROVIDER undertakes to give to the BENEFICIAR
One globally unique MFID, registered by the PROVIDER.
The provided MFID is filled in below by the PROVIDER when he has received and approved two signed
originals of this agreement and the administrative fee of 100 EURO (one hundred) per MFID.
MFID Hexadecimal number:
MFID Binary number:
The code above is given as a two digit hexadecimal (0-F) number, and as a 8 bit binary number. The most
significant digit and bit are positioned to the left. The range of the MFID code is 04 to 7F.
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EXAMPLE: The hexadecimal number "AF" equals the binary number "10101111".
The BENEFICIARY undertakes:
1. To apply and use the MFID in accordance with rules in [
1].
2. To return the MFID to the PROVIDER, within 5 years, if the MFID has not been used.
Ref [
1]: ETSI TS 102 361-1 [13]: "Technical Requirements for Digital Mobile Radio (DMR); Part 1: Air
Interface (AI) protocol".
In case the BENEFICIARY violates any of the obligations incurred on him by the present undertaking, he
shall be liable of indemnifying ETSI for all losses suffered directly or through claims from legitimate DMR
users.
All disputes which derive from the present undertaking or its interpretation shall be settled by the Court of
justice of Grasse (Alpes-Maritime - France) and with the application of French Law regarding questions of
interpretation.
Made in two originals, one of which is for the PROVIDER, the other for the BENEFICIARY; both originals
signed by a legal representative of the company/organization.
For the PROVIDER For the BENEFICIARY
(signed)..........................................................
(Name, Title (typed)) .....................................
(signed)..........................................................
W. Weigel, Director General (Name, Title (typed)) .....................................
.......................................................................
(Date) (Date)
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Annex J (informative):
Change requests
The present document contains change requests as described in table J.1.
Table J.1: Change requests
No Standard
Version
Clauses affected or description Title
001 1.1.1 B.2.1, B.2.3 Clarification for BPTC parity calculation
002 1.1.1 7.2, 9.1.8, 9.3.31and addition of 7.4 Add MBC message structure to Part 1 of standard for
document consistency
003 1.1.1 8.2.2.1, 8.2.2.2, 9.2.1, 9.2.2, 9.2.3, 9.2.4,
9.2.5, 9.2.6, 9.2.7, 9.2.8, 9.3.6, 9.3.22
Change data slot types of confirmed and unconfirmed data to
½ rate and ¾ rate coding
004 1.1.1 New clauses 8.2.1.5, 8.2.1.6, 8.2.1.7,
9.2.10, 9.2.11, 9.2.12, 9.3.33, 9.3.34,
9.3.35, 9.3.36, 9.3.37, 9.3.38
Add short data header block structure to Part 1 of standard for
document consistency
005 1.1.1 6.2 table 6.1
Table 6.1 has to be updated according the changes of CR002
and CR003
006 1.1.1 Annex B table B.1
Table B.1 has to be updated according the changes of CR002
and CR003
007 1.1.1 9.3.18
SAP identifier values need to be updated due to data
resolutions
008 1.1.1 9.3.17
Data Format values need to be updated due to CR004 and
CR009
009 1.1.1 New clauses 8.2.1.8, 8.2.2.5, 9.2.13,
9.2.14, 9.3.39, 9.3.40, 9.3.41, 9.3.42
UDT message structure need to be added to Part 1 of
standard for document consistency
010 1.2.1 8.2.1.1, 8.2.1.2, 9.2.1, 9.2.6, new
9.3.17A, 9.3.18
IP header compression
011 1.2.1 1, 3.1, 3.3, 4, 4.1
Clarifications and editorial modifications
012 1.2.1 4.2.1, 4.3, 4.61, 5.1.2.2, 5.1.2.3, 5.1.3.1,
5.1.4.5, 5.1.5.2, 5.1.5.4, 5.1.2.7, 5.2.2,
5.2.2.1, 5.2.2.2, 5.2.2.2.1, 5.2.2.3
Modifications in clause 4 and 5
013 1.2.1 6.1, 6.2, 6.3, 6.4.2, 7.1, 7.1.3, 7.1.3.2,
7.2, 7.3, 7.4
Modifications in clause 6 and 7
014 1.2.1 8.1, 8.2, 8.2.1, 8.2.1.1 to 8.2.1.8, 8.2.2.1
to 8.2.2.5
Modifications in clause 8
015 1.2.1 9.1.4, 9.1.9, 9.2.9, 9.2.13, 9.3.5,
10.2.3.1.1 to 10.2.3.1.3, 10.2.3.2.1,
10.2.3.2.2
Modifications in clause 9 and 10
016 1.2.1 Annex A, B, B.2.1, B.2.3, B.3.6, B.3.8,
C.1, C.2, D, D.1, D.2, E, F.1, G.1, G.1.1,
G.1.2
Modifications in annexes
017 1.3.1 7.1.1, 7.1.2, 7.2.1, 7.4.1, 8.2.1, 8.2.2.2,
B.3.12
Addition of Slot Type CRC inversion mask to improve protocol
robustness
018 1.3.1 Annex B, table B.1
Alignment of terminology of table 9.22 and table B.1
019 1.4.1 8.2.2.4
Align Data Terminator LC definition throughout documents
020 1.4.1 8.2.1
Correct Data Header CRC cross reference
021 1.4.1 7.1
Correct Short LC Figure
022 1.4.1 9.3.21, 9.3.33, 9.3.40 and 9.3.41
Data Blocks to Follow Information Element
023 1.4.1 B.3.7, B.3.8, B.3.9 and B.3.10 and 3.3
CRC clarification to reduce ambiguity
024 1.4.1 B.1.1and E table E.1 and E.2
BPTC (196,96) Performance Improvement
025 1.4.1 Annex E table E.4
Table E.4 Correction
026 1.4.1 8.2.1.3, 9.2.1, 9.2.4, 9.2.5, 9.2.6, 9.2.11,
9.2.12 and 9.3.20
Response Data header correction
027 1.4.1 Annex B table B.1
Table B.1 correction
028 1.4.1 B.1.1, B.2.4
Rate ½ and Rate ¾ editorial changes
029 1.4.1 6.1
Vocoder Socket Voice Frame order
030 1.4.1 8.2.2.1, 8.2.2.2, 9.2.2, 9.2.7
Confirmed and Unconfirmed Data
031 1.4.1 9.2.8, 9.2.14
Clause 8.3 reference removal
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No Standard
Version
Clauses affected or description Title
032 1.4.1 6.2, 9.3.6, B.3.12
Data type clarification
033 1.4.1 5.2.1.3
BS Activation clarification
034 1.4.1 6.2, 8.2, 8.2.2.1, 8.2.2.2, 9.2, 9.3.22,
9.3.6, B, B.2, B.3.12
Rate 1 Data transmission
035 1.4.1 8.2.1.3, 8.2.1.4, 8.2.1.5, 8.2.1.6, 8.2.1.7,
8.2.1.8, 9.2.1, 9.2.4, 9.2.6, 9.2.10, 9.2.11,
9.2.12, 9.2.13
DPF and Format alignment
036 1.4.1 F.1 and F.2
Layer 2 Timer and Constant Changes
037 1.4.1 9.2.8
Rate ½ Last Data Block Corrections
038 1.4.1 5.2.1.4, 5.2.2.1.1, 5.2.2.2.1, 5.2.2.2.4 and
7.3
Typo Changes
039 1.4.1 5.1.1.1 and 5.1.1.2
Slot Numbering Clarification
040 1.4.1 9.3.33
Appended Blocks Clarification Note
041 1.4.1 5.2.2.3
Impolite CSBK responses
042 1.4.1 8.1 and 9.3.25
Fragment Sequence Number Clarification
043 1.4.1 B.3.9
Rewording of part of CR023
044 1.4.4 5.2.1.6 Transmit admit criteria correction
045 1.4.4 8.2.2.3 Response packet definition table correction
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Annex K (informative):
Bibliography
• ETSI TR 102 335-1: "Electromagnetic compatibility and Radio spectrum Matters (ERM); System reference
document for harmonized use of Digital Mobile Radio (DMR); Part 1: Tier 1 DMR#, expected to be for general
authorization with no individual rights operation".
• ETSI TR 102 335-2: "Electromagnetic compatibility and Radio spectrum Matters (ERM); System reference
document for harmonized use of Digital Mobile Radio (DMR); Part 2: Systems operating under individual
licences in the existing land mobile service spectrum bands".
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History
Document history
V1.1.1 April 2005 Publication
V1.2.1 January 2006 Publication
V1.3.1 September 2006 Publication
V1.4.1 December 2006 Publication
V1.4.5 December 2007 Publication
